You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
Check compatibility
MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later MacBook Pro introduced in mid 2010 or later Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later
Jul 31, 2020 Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu. If your Mac isn't compatible with macOS Sierra, the installer will let you know.
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS Sierra, the installer will let you know.
Make a backup
Clearing the Cache After Deleting a Program or Application Step 1: Open up the Finder and select 'Go.' Step 2: Select “Go to folder”. Step 3: In the search bar, enter “/Library/Application Support” and press enter. You can keep the folders. Dec 06, 2019 Use the Finder to delete an app Locate the app in the Finder. Most apps are in your Applications folder, which you can open by clicking Applications in. Drag the app to the Trash, or select the app and choose File Move to Trash. If you're asked for a user name and password, enter the name. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the. Unfortunately, deleting apps from LaunchPad can be a difficult process. Deleting apps that you purchased from the App Store is a simple process but there are some apps, like Safari or Mail, that the operating system does not allow you to delete. If you wish to delete these apps, you will need to enter some simple commands in your terminal.
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS Sierra
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS Sierra, use this link: Download macOS Sierra. A file named InstallOS.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
Learn more
How to remove 'Your MacOS 10.13 High Sierra is infected with 3 viruses!' from Mac?What is 'Your MacOS 10.13 High Sierra is infected with 3 viruses!'?
'Your MacOS 10.13 High Sierra is infected with 3 viruses!' is one of many fake virus alert messages. It targets MacOS users only and is displayed on untrustworthy, deceptive web pages. Typically, users arrive at these sites inadvertently - they are forced to visit them by potentially unwanted applications (PUAs) that users often install inadvertently. Once installed, PUAs cause unwanted redirects to deceptive websites, feed users with various ads, and gather data relating to browsing activity.
Scammers behind the 'Your MacOS 10.13 High Sierra is infected with 3 viruses!' fake virus alert claim to be Apple support team members and state that their website has detected a trojan virus (e.tre456_worm_osx) on your Mac computer. According to this alert, as well as the trojan, three other virus infections have been detected: two malware infections and one spyware/phishing infection. Scammers urge users to take immediate action and remove the detected viruses to prevent system damage and data loss. They give users five minutes. Note that Apple has nothing to do with this scam. Cyber criminals use the company name to promote their fake product, which they state will remove viruses and prevent any further damage. In this case, they promote the Mac Cleanup Pro application. When installed, this app will detect even more infections and other problems on a Mac computer, however. This is simply a way to trick people into purchasing this product by displaying fake results. The scan itself is free, but removal of detected issues must be purchased. Never trust scammers or purchase/use their apps. We recommend that you ignore 'Your MacOS 10.13 High Sierra is infected with 3 viruses!' simply by closing the browser window or tab. If this deceptive website prevents you from closing the window/tab, use Activity Monitor to force-quit the browser. Do not restore the closed session, since this will reopen the same deceptive website (or another site that led you there).
Users commonly arrive at these websites due to installation of potentially unwanted apps. These PUAs cause redirects to deceptive websites, deliver intrusive ads, and gather data. They display coupons, banners, surveys, pop-ups, and so on. They are displayed via tools that enable placement of third party graphical content on any site and also conceal underlying content. They affect browsing quality and, if clicked, lead to untrustworthy websites or run scripts designed to download other unwanted apps. Furthermore, PUAs record browsing-related data (such as IP addresses, keystrokes, search queries, URLs of visited websites, etc.) and also personal details. Developers share the data with third parties (potentially, cyber criminals) who misuse it to generate revenue. Thus, having these apps installed can lead to computer infections, privacy/browsing safety problems or even identity theft.
Many similar websites display fake messages and virus/error, and other, alerts. Some examples of other fake messages are Your OS High Sierra Is Infected With (3) Viruses!, Your Computer Was Locked, and Mac OS Support Alert. Scammers often use these fake messages to trick people into believing that their computers are infected or damaged, and to encourage them to purchase unnecessary products or technical support/guidance. Most PUAs are very similar - developers promote them as 'useful tools', however, these are merely attempts to give the impression of legitimacy and to trick users into downloading and installing them. Typically, they deliver none of the functionality promised and are designed only to generate revenue for the developers.
How did potentially unwanted applications install on my computer?
Some potentially unwanted apps are available for download on their official websites, however, many users are tricked into installing them through clicked intrusive advertisements or a deceptive marketing method called 'bundling'. Developers use this method to trick users into installing unwanted applications together with other software. In most cases, PUAs are hidden in 'Custom', 'Advanced' (and other similar) options/settings of the installation/download dialogs. Information regarding the presence of PUAs in the download/installation set-ups is not properly disclosed. Nevertheless, inadvertent installations are usually caused by users who skip installation steps, leave download/installation settings unchanged, and click various ads.
How to avoid installation of potentially unwanted applications?![]()
Careless behaviour and poor knowledge of these threats are the main reasons for problems relating to online safety and privacy. To protect your privacy and keep your computer safe, browse the web and download, install software carefully. Do not download software from unofficial/untrustworthy websites, using third party downloaders/installers, or other such tools. Check all available 'Custom', 'Advanced', and other similar options when installing or downloading software. Many malicious/untrustworthy advertisements lead users to adult dating, pornography, gambling, and other similar untrustworthy websites. If you experience constant redirects to these websites, check all extensions, add-ons, and plug-ins that are installed on your browser and remove any suspicious/unwanted entries immediately. Also apply this to suspicious programs installed on your computer. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.
Appearance of 'Your MacOS 10.13 High Sierra is infected with 3 viruses!' scam (GIF):
Text presented in deceptive website pop-up window:
IMMEDIATE ACTION REQUIRED
We have detected a trojan virus (e.tre456_worm_osx) on your Mac.
Ftp client app mac. Press OK to begin the repair process.
Screenshot of deceptive website background:
Text presented in deceptive website background:
Your Mac is infected with 3 viruses. Our security check found traces of 2 malware and 1 phishing/spyware. System damage: 28.1% - Immediate removal required!
The immediate removal of the viruses is required to prevent further system damage, loss of Apps, Photos or other files. Traces of 1 phishing/spyware were found on your Mac with OSX.
To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!
4 minute and 22 seconds remaining before damage is permanent.
Screenshot of a Mac Cleanup Pro app:
Instant automatic Mac malware removal:Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of Mac malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for MacBy downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.
Quick menu:
Video showing how to remove unwanted applications distributed by fake 'Your MacOS 10.13 High Sierra is infected with 3 viruses!' pop-up scam:
Potentially unwanted applications removal:
Remove potentially unwanted applications from your 'Applications' folder:
Click the Finder icon. In the Finder window, select 'Applications'. In the applications folder, look for 'MPlayerX', 'NicePlayer', or other suspicious applications and drag them to the Trash. After removing the potentially unwanted application(s) that cause online ads, scan your Mac for any remaining unwanted components.
Combo Cleaner checks if your computer is infected with malware. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.
Remove 'your macos 10.13 high sierra is infected with 3 viruses!' virus related files and folders:
Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder..
Check for adware-generated files in the /Library/LaunchAgents folder:
In the Go to Folder.. bar, type: /Library/LaunchAgents
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.
Check for adware generated files in the /Library/Application Support folder:
![]()
In the Go to Folder.. bar, type: /Library/Application Support
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.
Check for adware-generated files in the ~/Library/LaunchAgents folder:
In the Go to Folder bar, type: ~/Library/LaunchAgents
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.
Check for adware-generated files in the /Library/LaunchDaemons folder:
In the Go to Folder.. bar, type: /Library/LaunchDaemons In the “LaunchDaemons” folder, look for recently-added suspicious files. For example “com.aoudad.net-preferences.plist”, “com.myppes.net-preferences.plist”, 'com.kuklorest.net-preferences.plist”, “com.avickUpd.plist”, etc., and move them to the Trash.
Scan your Mac with Combo Cleaner:
If you have followed all the steps in the correct order you Mac should be clean of infections. To be sure your system is not infected run a scan with Combo Cleaner Antivirus. Download it HERE. After downloading the file double click combocleaner.dmg installer, in the opened window drag and drop Combo Cleaner icon on top of the Applications icon. Now open your launchpad and click on the Combo Cleaner icon. Wait until Combo Cleaner updates it's virus definition database and click 'Start Combo Scan' button.
Combo Cleaner will scan your Mac for malware infections. If the antivirus scan displays 'no threats found' - this means that you can continue with the removal guide, otherwise it's recommended to remove any found infections before continuing.
After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.
'Your MacOS 10.13 High Sierra is infected with 3 viruses!' virus removal from Internet browsers:Remove malicious extensions from Safari:
Remove 'your macos 10.13 high sierra is infected with 3 viruses!' virus related Safari extensions:
How to open damaged app mac pro. Open Safari browser, from the menu bar, select 'Safari' and click 'Preferences..'.
In the preferences window, select 'Extensions' and look for any recently-installed suspicious extensions. When located, click the 'Uninstall' button next to it/them. Note that you can safely uninstall all extensions from your Safari browser - none are crucial for normal browser operation.
Remove malicious plug-ins from Mozilla Firefox:
Remove 'your macos 10.13 high sierra is infected with 3 viruses!' virus related Mozilla Firefox add-ons:
Remove App Mac Sierra 10.13
Open your Mozilla Firefox browser. At the top right corner of the screen, click the 'Open Menu' (three horizontal lines) button. From the opened menu, choose 'Add-ons'.
Remove App Mac Sierra Mac
Choose the 'Extensions' tab and look for any recently-installed suspicious add-ons. When located, click the 'Remove' button next to it/them. Note that you can safely uninstall all extensions from your Mozilla Firefox browser - none are crucial for normal browser operation.
Remove malicious extensions from Google Chrome:Sierra Update For Mac
Remove 'your macos 10.13 high sierra is infected with 3 viruses!' virus related Google Chrome add-ons:
Open Google Chrome and click the 'Chrome menu' (three horizontal lines) button located in the top-right corner of the browser window. From the drop-down menu, choose 'More Tools' and select 'Extensions'.
In the 'Extensions' window, look for any recently-installed suspicious add-ons. When located, click the 'Trash' button next to it/them. Note that you can safely uninstall all extensions from your Google Chrome browser - none are crucial for normal browser operation. Mac app run exe.
Remove App Mac Os X
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