If you own Dungeon Keeper 1 on GOG, you can find KeeperFX directly, without the need to first install Dungeon Keeper gold.

See the news here: https://www.gog.com/en/news/stalker_anomaly_gmdx_realrtcw_and_more_join_gog_oneclick_mods

Get KeeperFX on GOG here: https://www.gog.com/en/game/keeperfx

People who do not own DK1 on GOG, but already own it on another platform or disk, are best off using the Web-installer on KeeperFX.net.

Both the original campaign and the original Deeper Dungeons expansion pack can be played in KeeperFX.

Is this the same version of KeeperFX on gog than on the KeeperFX website ?
I'm asking because some of gog other "one click" mods are not up to date with the actual mod latest version (example the Revision mod for Deus Ex )

It's version 1.2, like is currently the latest full version on the website. I hope to update GOG too when we release the next version, GOG said it would not be a problem, but we'll have to see.

Thanks for the information