A rather late follow up on this, I went back in to tinker with the application in an effort to remove the Windows 7 or lower limitation. Had to do some digging to understand the TLC/TK codebase that runs the toolkit, some DLL analysis, a whole bunch of nonsense... After a lot of trial and error, I was able to modify the toolkit to run in Windows 8 or 10 environments. Mostly because I was tired of using a VM for all my work. I've also looked into modifying the TCL/TK scripts to run off a newer version of the coding language, but this seems to be unnecessary and I'd rather not introduce changes to the compiler.
I'll be doing some user testing on the application but I would expect an updated version soon.