Brand new Mac Mini w/ Catalina.
I migrated my apps from an old computer, not realizing the 32bit limitation of Catalina. So I have a bunch of old stuff that doesn't work.
Reaper actually was opening ok, but I upgraded to 6.12c because it specifically said it was for Catalina. Once I upgraded Reaper, it now crashes at startup.
I don't actually have an interface installed yet, so just the built-in stuff.
Here's the crash report:
https://pastebin.com/6Lv9RcLa
EDIT: I soled this issue by removing some old VSTs. I can't figure out how to delete a thread, so I'm updating it.