Trying to install GoG version of BG3, requires .net Framework

I'm trying to install the GoG version of Baldur's Gate 3 on my Deck. I had it working years ago when I first got my deck but after not using it for many many months, it fell out of date and recently failed to launch. I tried updating, repairing etc, but it all failed so I decided to reinstall through Heroic launcher which is when my current problems started.

Now it's asking for the .net Framework and every means of installation I have found either doesn't seem to want to work for me (I've tried going to the Arch website for the Arch package, Protontricks and Winetricks through q4wine, as recommended by other posts in this sub) or requires the sudo password that I've apparently forgotten in the last 2.5 years. (if you have a means of changing it without requiring a fresh install of the OS, I'm all ears btw.)

So I'm hoping someone can help me find a way to get BG3 working on my deck again.

I know it won't be the Steam Deck native version through Steam so performance won't be the best, but it will be better than not playing it. Plus I remember the performance being tolerable when I had it working on a plane 2ish years ago.

Thanks in advance for the help.