MOV videos not rendering

[Cullen5C45]

As of yesterday, I am having issues with MOV files rendering properly in Pr.

In the editing window, everything looks fine, but when I export it, I get nothing but black or green blocks.

I have also recently gotten popup windows. I posted screenshots below.

I deleted the folder that one of the windows said to delete, but it didn't help.

Thoughts? 

[Ann Bens]

Are you using a trial, if so no HEVC support. Get a subscription to activate feature.

[Cullen5C45]

I do have an account, not a trial. Don't know how to activate the feature.

[Ann Bens]

Sign out of your account

Reboot

Sign in: see how that goes.

Which version and build are you using?

[Cullen5C45]

15.2.0 (build 35)

I'll try signing out and in again. I uninstalled and reinstalled already.
Thanks for your help. This is my whole life this morning. If you can continue to keep an eye on this thread, it would mean the world.

[Peru Bob]

See here:

https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

[Cullen5C45]

I'm not the administrator of my plan, so I can't see the Manage page - but I tried all the rest to no effect