Great! Will definitely give this a go as I get time.
The first thing to report is with regards to installation. I assumed I should probably uninstall the earlier version, so I did that. I'm on Windows 8.1. After uninstalling the old version and then executing the installer for the new version, I got two different error messages during installation but neither appears to have stopped the tool from working.
The error messages I saw are shown in the attachment below. The user I installed with is an Administrator.
wshom.ocx is a Windows Scripting Host Object Model wrapper. I used it for folder management when changing a game's directory (which probably isn't going to be done very often). It's old code, and in other places where I need to access directories, I use API calls. I should probably clean this up and replace it with API calls too, so that OCX isn't needed anymore.
Regarding the second error, it's nothing as nefarious as compatibility errors - it's a result of changing some setting variable types between versions and failing to check for it when loading settings. ugh, I should know better. I've already fixed that bug.
I've already identified over 25 new things (either minor bugs [thank goodness no major issues found yet!], or feature improvements) that I'm working on - mostly in Picture Editor and Sound Editor. I'll upload that here and keep it updated as new things are reported so you can avoid reporting what's already known.
Thx all for the feedback!