Does anyone know a level cap remover that works with the GOG version on Vista? (And preferably the mods in the stickied thread.) Thanks!

First, do not install the game to Program Files or another system folder. Use another drive if possible.

The universal level cap remover works.

There are certain things you need to consider before applying it.

In an unmodified game, your party members level with you, and when you hit 50 they stop levelling and get stuck at whatever level they achieved. This kinda sucks.

If you only need to level your followers and can personally live with a cap of 50, know that the final patch by Drog Black Tooth includes this by default.

IMPORTANT: encounter tables end at 50. If you go above the level cap, you won't be having random encounters at all (except assassins, if applicable) unless you edit the encounter tables. I never did that myself but the process should probably go like this:
1. Get an Undat program.
2. Undat arcanum.dat.
3. Edit wmap_rnd.mes.
4. Put the edited wmap.mes in arcanum\data\rules.