Imovie is not installing.Before somedays i tried to install and its installing and i canceled it but now its not installing.What should be the reason?

Hello nahid212,

Thanks for that info and for choosing the Apple Support Communities. If I understand correctly, you are unable to install iMovie on your Mac. First, make sure your Mac is up to date, as the updates contain stability fixes that can resolve issues like yours, as well as important security updates to keep your Mac safe. Once your Mac is up to date, then try installing iMovie again.

How to update the software on your Mac

Use the App Store to update apps on Mac

Next, use safe mode to start up your Mac as it does the following things:

• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files

Log in to your user account and test the issue while in safe mode and then restart normally and test the issue again.

Use safe mode to isolate issues with your Mac

Graphics performance limited in macOS Recovery, safe mode, or Guest User mode

Cheers!