App Store not recognizing 10.15.7 macOS Catalina on my Desktop

Hi, sidstudio,

Try this procedure to obtain the latest iMovie version that your operating system will run:

To update/redownload iMovie 10, drag your iMovie 10 app from the Applications folder into the trash, but do not empty the trash. (You can skip that step if you had iMovie 10 on your computer before, but deleted it.) Sign in to the app store and open your purchases folder by clicking on your name at the bottom of the app store side bar. You will see your purchases displayed, including iMovie 10. Redownload/update iMovie from there. If not

successful, drag your present iMovie app out of the trash (if you moved it there) and return it to the Applications folder.

-- Rich

Great! Glad you were able to get the download.

— Rich