What happened to 2019 version of AME that worked with Premiere '19? (Updated to 2021 AME & Premiere)

One day I'm creating proxies for my videos to able to smoothly edit in Premiere and the next I've lost the version of AME to do so. SO, I unfortunately had to start using Premiere 2021, and NOW the version of AME that works with that will NOT complete the process to create proxies for all of my clips. WHY?!

How can I get the version of AME back that worked with Premiere 2019?

And what can I do to help my issues with 2021 version of both programs? I just updated them now, so let's see if AME 15.1 completes the proxy creation process...