I have installet Fallout 4 G.O.T.Y and then Fallout London, but nothing happens when i press start. only a black screen comes up. any tips???

I'm having the same problem. The game starts. When I click on New, it mentions that achievements are disabled and to press Enter to continue or Esc to exit. Upon hitting enter, the screen goes black with the little symbol in the lower right hand corner and then it crashes to the Gog Galaxy screen.

I did, alternately, start the actual Fallout 4 GOTY version, which checked my video settings and then proceeded to open the FOLON start page. The same results as before.

Currently doing a file verification.

****Edit****

The verification downloaded 1.1mb; however, running it returned the same result. If it helps anyone, when entering the settings option, Audio is greyed out for a moment or three with a spinning icon before it becomes "clickable."

same here, i downgraded my steam install and installed london after. the command window shows up then crashes

No tips. It does the same to me.

Not sure if this is any help to anyone. I deleted both games and reinstalled fallout 4 goty. Before doing anything else, I started f04 and did the character creator and then exited after saving. I then installed FOLON. The game then started up and let me open my save. Nate was wearing a GOG t-shirt, so I'm thinking it worked.

At the very least, the game started and didn't crash.

Good luck!!

Same here. Did a file check and it indicated a corrupt install. Downloading again.
I'll update if it works or not.
Re-installed and checked both installs, indicates all good.
Just wont start or anything when I click the play button.

Update: so when I checked file integrity after clicking the play button it indicates corrupt files now.