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dgs169 Author

Level 1

4 points

Mojave v. Catalina on iMac

My iMac kept crashing, so the geeks wiped the drive.

Reload it with OS Mojave (like it had before).

BUT then Keynote. app and iMovie.app would NOT reinstall until the iMac installed Catalina.

My MacBook Air runs Mojave, no problems with Keynote, iMovie, Quicktime.

How can I get the iMac working again with Mojave, as it was. If the MacBook can run all these things, why not the iMac?

Also, Catalina will not accept QuickTime at all.

What does Apple recommend we run to play MOV files? and do the things QuickTime does/did?

iMac 27″ 5K, macOS 10.15

Posted on Apr 14, 2021 2:43 PM

Top-ranking reply

Matti Haveri

Level 6

16,655 points

Posted on Apr 14, 2021 11:04 PM

Backup and log out from App Store, delete Keynote and iMovie, reboot, and then try to reinstall them and see if that works. If not, I'd make a bootable flash drive and use it to APFS-erase the device (not just the volumes under it to get rid of extra Catalina volumes) and cleanly install Mojave.

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Mojave v. Catalina on iMac

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