I had the Substance Designer errors as well when I upgraded. I went into the offending scripts, did Control-F and found the if-then statements, etc. that included the procedural material words, then commented them out with, like, // before each line. then saved. then those procedural errors went away.
I don't even use Substance Designer. if you do and can't just comment these out, I'd definitely try asking the Substance or Unity people. I think Substance has some importer on their web site, which i was going to get to convert stuff before I realized I've never used Substance. I'm more upset by my shader forge shaders no longer working since Shader Forge ended updates, but I can rebuild them faster and better using Shader Graph. It'll be good exercise for me, but I only have like 12.
Playmaker is an amazing tool that has changed my career path to game developer. It has great and responsive support. I've only used it/been a gamedev for four years at this point, and in that time I've been fortunate that the Playmaker devs could easily help when I've had upgrade errors. They've helped me learn quite fast, and I even learned for myself how to comment out the six or so lines of code to fix the Substance errors.
I recommend Playmaker to everyone. I may try out Bolt someday, but I don't know what it could offer that Playmaker hasn't already offered. Maybe I'm just naive, lol. But I couldn't ask for a better support team.