I'm on a Macbook Pro running OS 10.15.7 Catalina and just downloaded the Adobe CC Suite a month or so ago and everytime I try to open Media Encoder it freezes as soon as it gets to Loading ImporterQuickTime.bundle. I have tried this dozens of times now and have only got it to successfully open once and that took about 10 minutes.
I moved your post over from the "Using the Community" forum, which is for getting help using this forum system, to a better forum.
I hope this helps. Best of luck to you.