Error when exporting iMovie

The Compressor Kit Error message has been reported with increasing frequency

of late.

Lately users with the problem have been able to fix it by reinstalling/updating/upgrading

iMovie and, if necessary, the operating system to Catalina.  However, you already are running

Catalina. That makes it even more puzzling as to why you are getting this error.

Sometimes successful is starting up in Safe Mode (see Finder menu for

instructions) and then after everything loads immediately shutting down and

rebooting in normal mode. However, you already have tried Safe Mode without

success.

Recently there has been a breakthrough on this issue, discovered by

nicocaro, who posted a solution on this forum. Below is a link to the thread

where he describes how to solve the problem by removing a 64bit codec from an

iTunes update.  Other posters have successfully tried the solution. It

seems that updating iTunes may cause iMovie to exhibit the CompressorKit:Error

by implanting a 64bit architecture in the system library, that conflicts with

an older version of iMovie. That would explain why upgrading to 64bit Catalina

and current version of iMovie has solved it for some posters here.  Upgrading

to Catalina, however, would disable all older 32bit applications that would be

no longer supported. Some legacy media may not play in iMovie, either, and

would need to be converted.

Here's the link to nicocaro's solution:

 https://discussions.apple.com/thread/251266351

 And here as well:

https://discussions.apple.com/thread/251352619

Here's another link, though older, that describes what others have tried with

the Compressor Kit Error:

https://discussions.apple.com/thread/8265338

There may be some proposed solutions in the above link that will work for you.

All else failing, try calling Apple Support. The techs there are very savvy and

also have the capability of remotely accessing your computer. Click on the Contact

Support item in the upper right hand corner of this screen and navigate to a

place where you can provide your telephone number so that Apple Support can

call you back. I think that the file path is Contact Support/Mac OS/Applications/iMovie.

Good luck with this.

If you have time, post back with your results, as it may assist others who have

this perplexing issue, and will contribute to our data base.

-- Rich

That's correct. The latest version of iMovie will not work on High Sierra.

Try this procedure, that should get you the highest iMovie version that High Sierra 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. 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 and return it to the Applications folder.

-- Rich

Let’s hope it works.

— Rich

Great! Glad you got it working. :)

-- Rich