I have paid plan but Media Encoder still says HEVC only with paid plan.
This file requires the HEVC codec, which is available to Creative Cloud members. To upgrade to a paid plan go to:
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Double-check that your Creative Cloud Desktop is logged into your Adobe ID.
If logged in or not, I'd also restart.
If after that you're not getting a message prompting you to install HVEC the 1st time you use it, start a support chat with Adobe Support. It will take some patience as you work through the issue with them, but they should be ale to verify that everything is installed correctly and active.
I am having the same problem with the same notification implying I don't have a "paid plan". This computer is logged into Creative Cloud Desktop with the correct Adobe ID. I tried restarting and signing out/in again and that did not change anything. I was exporting HEVC files with premiere through media encoder (both are cc2020) less than a week ago so I doubt it's a problem with installation.
Since getting the error message and restarting, media encoder does not display the error message again but also will not export any file with the HEVC codec (rather - it does export the file just with no audio or video. just a super useful solid black silent file). Not wild about spending a few hours on the phone with Adobe Support since I will not be able to bill my clients/get paid for those hours.