When it comes to the WhirligigGo version, that's pretty much it. Meta have pretty much abandoned it. Worryingly they have also done this with the Quest 1.
So when it comes to the Go version there really isn't any way I can update as all the SDK's are dead and the Unity version has move on without backwards compatibility with anything including and before the Quest 1. Which is one of the reasons I've made it free. The Quest 1 will also become free at some point for the same reason.
When it comes to the Quest 2/3/pro all these are on app labs and if you've purchased it on itch.io then I'd be happy to provide you with a applabs key. Just email me phileday@yahoo.co.uk I will be releasing a major update for these very soon with a load of improvements, sharing location support and loads more. I'll be updating the itch.io quest 2/3/pro picovr and pimax here as well.
I hope that explains things :) Email if you want a code.
All the best
Phil