Hey TramplingPotion, unfortunately, I don't currently have one set up, and the Template is in a bit of a state of disarray at the moment, if you have questions you can fire away right here, but I'm starting to think that I either abandon Blunder, or start from scratch again to get it working with Blender 2.9+
You can check out BLUI in the meantime, or just Install one or more of my add-ons from Github: https://github.com/SpectralVectors if you just want to use RightMouseNavigation, or add some Custom Objects.
I've had people contact me about this project on itch, Github and Youtube recently, so maybe that's a good indication that it's worth putting the time into updating.