I found a recently updated github project that had unity & blend flies, and Textmesh & Parttools. I was able to open the project with 2019.4.14f1 and write mu files from it. I tried creating a new project using the packages from the working project, but that didn't work. I compared all of the project settings files and synced up the settings but couldn't get the new project working. Still not sure what I'm missing, but I was able to copy the working project, and clean out all of the assets to use as a manual template.