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Why is my install macOS High Sierra damaged?
The cause of this error is an expired certificate, and because the certificate is expired the “Install macOS” app for Mojave, Sierra, and High Sierra will not run.
Is macOS High Sierra still good in 2020?
Apple released macOS Big Sur 11 on November 12, 2020. As a result, we are now phasing out software support for all Mac computers running macOS 10.13 High Sierra and will end support on December 1, 2020.
Why is my High Sierra damaged?
The cause of this error is an expired certificate, and because the certificate is expired, the “Install macOS” app for Mojave, Sierra, and High Sierra will not run. Fortunately, there is a fairly simple solution to the “damaged” installer problem. Below are the download links for the recent versions of macOS.
How do I install macOS High Sierra 2020?
Hold down the [option] or [alt] (⌥) key on the keyboard and power on the device. When you see the boot selection screen as shown, release the [option] key. Use either the keyboard’s arrow keys or the mouse to select “Install MacOS High Sierra.” Press [enter] or click your selection with the mouse.
How do I speed up my High Sierra Old Mac?
Upgrade your RAM The current version of macOS (High Sierra) requires at least 2GB of RAM to run smoothly. One of the easiest ways to speed up your Mac is to install more RAM. Your machine has a fixed number of RAM ‘slots’ into which chips can be inserted.
How do I restart my Mac from High Sierra?
To restart the High Sierra installation Hold down Option-Command-R as you turn on or restart your Mac. When the main Utilities window appears, select Disk Utility and continue. Select your startup volume and click First Aid. If First Aid reports successful, quit Disk Utility and select Reinstall macOS. (or Install macOS)
What to do if your Mac is not compatible with High Sierra?
If you haven’t started the process of upgrading yet, check if the Mac is compatible with macOS High Sierra and make a bootable backup. Do it now, before you do anything else.
Why is Microsoft Office not supporting Mac High Sierra?
With every macOS upgrade there are older versions of apps that are no longer supported by their developers. One casualty of High Sierra is Microsoft Office 2011 for Mac. Microsoft has said that it will not offer support for it running on new macOS and it’s likely you’ll have problems with it.
How do I erase and reinstall macOS Big Sur?
Type a name for the volume in the Name field, click the Format pop-up menu and choose APFS, then click Erase Volume Group. When the erase process is complete, click Done, then choose Disk Utility > Quit Disk Utility. In the Recovery app window, select “Reinstall macOS Big Sur,” click Continue, then follow the onscreen instructions.