Hello.
Just bought Ammo Pack. When I want to install BEL or BTCOD installation stucks at 2% and doesn't progress even after a while. No matter if I install it in GOG installation folder or some separate folder, SSD or HDD. I was searching forum but didn't found anything useful information about my problem. I'll be grateful for help.

Are you using GOG Galaxy, or a standalone installer?

I use Galaxy.
EDIT: It was GOG Galaxy issue. After system reboot game installed correct.
But now I have another little problem. I solved DirectX 5 issue thanks to Uncle Google, but I am able to launch the game only by the .exe from game installation folder. Lauching it through Galaxy doesn't work - game doesn't start. Any idea?

How exactly can I do that?

In your library view, right-click on the game's cover, then go to Manage installation -> Configure. Tick the box that says "Custom executables / arguments", then click on "Add another executable / arguments" and browse to the renamed executable. Optionally, you can select that as the default executable for when you click Play.

Thanks. I did as you said but still can't launch the game via Galaxy.