Download Gore SE in 3 Steps

Step 1: GORE SE 1.60.10

Download the official installer from any mirror listed above.
→ Install it, but don't start it yet.

Step 2: GETMETO 1.60.19

Download and install this after installing the game
This will get you straight to 1.60.19 without having to wait for the looooong auto-updating progress.
→ Install it, start GORE and enjoy!

Step 3: Custom Maps

Two different Map Packs. The first has all Maps (read the !ReadMe!KVAKO!.txt inside) and the other only those considered playable.
→ Install this and you'll have every map you need!