![]() For security reason, Microsoft has deprecated the use of SHA-1.For more information, see Microsoft Teams installations on a Mac. Starting with Version 16.21, Microsoft Teams will be installed by default for new installations if you're using the Office suite install package. ![]() Click Reinstall macOS and follow the onscreen instructions.Turn on your Mac and immediately press and hold the Option-⌘-R keys together until you see the Apple logo or the spinning globe icon.Using the method below, you will be able to upgrade to the latest macOS that is compatible with your Mac. To do this, you need to restart your Mac from macOS Recovery. If you still could not update, you may try this. Double-click the downloaded file, if it does not start automatically.For example, using a combo update, you cannot upgrade from macOS Mojave to macOS Catalina. But you cannot go from, let’s say, 10.14.x to 10.15.x. This further means that, using a combo update, you can update from macOS 10.15 directly to Mac OS X 10.15.2, skipping the 10.15.1. A combo update is a combined update that means that it contains all of the changes since the original release of that major version. Please note that combo updates let you update your Mac from a prior version of macOS within the same major release. You can back up with Time Machine or you can use iCloud. Please note that before you continue, you may want to back up your Mac. You can use a combo update to install Mac updates. To exit safe mode, restart your Mac normally, without pressing the Shift key. Then exit safe mode when you are done (in either case).To do that, turn off your Mac and then turn on your Mac and immediately press and hold the Shift key until you see the login screen. If you are still having issues, then you may try the followings: Safe mode You can check if Apple servers are experiencing issues. It is possible that Apple servers are overloaded as a lot of people may be trying to update. Or there could be issues with Apple servers.If you are using a Wi-Fi connection, try a wired connection, if possible. You may want to restart your router and modem to fix this problem. You may have a slow internet connection.It is possible that your Mac may unable to reach the update server.To reset PRAM, turn off your Mac and then turn it on and immediately press and hold the Option, Command, P, and R keys together for about 20 seconds. Reset PRAM on your Mac and then try again.If you have any external hard drives or peripherals connected to your Mac, try removing them.If the update does not complete, your computer may seem stuck or frozen, for an extended time, try to restart your computer by pressing and holding the power button on your Mac for up to 10 seconds.Also ensure than your Macbook, if it is a Macbook, it is plugged it into AC power. Do not put your Mac to sleep or closing its lid. Make sure that you have an Internet connection to update your Mac.If you see a “ Update Not Found” error, see this article. ![]() You can easily free up storage space on your Mac. To see if your computer has enough room to store the update, go to the Apple menu > About This Mac and click the Storage tap.
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