Attempting to install a game, getting partial install, and then it fails (with an e9 error message). Game installs roughly 1/3rd of the way through before giving error. Have uninstalled game, attempted to reinstall again to have the same place/error. GoG Galaxy and Graphics card are up to date, downloading other games without issue.

Was able to download/install game as of 3-4 days ago wtihout issue, had same difficulties last night and of this morning when attempting to download again.

Galaxy is known to have downloading issues before.

Note: With Galaxy, generally the first 95-97% is download/extraction, and the last 3% MAY be installing dependencies. At 1/3rd i doubt it got anywhere near that.

Have you tried the offline installers?

Yeah, have tried with no luck.

Also tried manual install and get said there's no pathway to things. So probably donig something wrong there on top of it.

Odd...

How big is the game?
How much free space do you have?
Have you tried checking the integrity in the setup program?

(A big game may need to expand and then copy before being removed from the temp folder, so you could need a lot of free space on a big game).