Hi all - well, I'm stuck. I can get Fallout London to run once after doing the the installer/update, which can take a long time. If I quit the game, it won't start again - it'll try to open a window for a few seconds, and then the game just stops running - no errors. I'm guessing it's a graphics issue (RX5700XT on a 3440x1440 display).

If I run the installer again, it will work the next launch but obviously I can't do this every time.
I'm assuming it's creating or updating an ini file or something. Any suggestions on a quicker way to purge whatever it's doing rather than having to run the installer every time I want to play?

Cheers!

I don't have it installed, but I can make a suggestion. Not sure how helpful it will be.

I usually backup certain core files before trying mods for the first time. The mods part doesn't matter, it's what I do that may help.

So what I normally do is go to the game install folder and sort by modified date after exiting the game to see which files got updated. I also do this for other folders the game may save files, like AppData or Documents. Once I find these files, I make a copy of them to some other location. Ofc, back them up before playing or you'll still be in the same boat next time too lol. So if you have to re-install again, do this first before starting the game.

Now if something goes wrong (mods in my case), I can just copy back these files (after removing the mods) and usually the game is back to the previous state.

Ofc, there is also the registry to consider, Pillars of Eternity is an example where I had to backup the registry also. For some reason, reinstalling the game did not reset the previous settings as it seems the uninstall process didn't remove the registry entry. (maybe it was cause I installed a mod and the mod itself kept the entries there, who knows.)

Setting aside POE game, you can still try the "making a copy" step and see if that helps. Oh yeah, keep in mind to check any sub-folders for updated files too. Since main folder may not be the only place with files update during each gameplay session.

These were things people also did for games that only had one save. By backing up the save folder(s), you could quit the game if something wierd happened and copy back the files as a way to recover to an earlier save point in the game. Rather than losing everything and having to restart.

Hope this helps avoid you having to reinstalled that massive game lol. It's also a lot of wear and tear on the life of your drive (SSD in my case).
.
Edit:
- I just wanted to add, I only use offline installers, not Galaxy. So if using Galaxy, there may be Galaxy files involved as well, no idea. But I thought I'd at least mention that while it popped into my mind.
.