I haven't been on the site in a while, and I've noticed quite a few of the game installers have been updated. For example the Dungeon Keeper Gold installer I had was 2.0.0.4 but the one currently available for download is 2.1.0.7.
I assume some changes have been made such as bug fixes or improvements. Is there somewhere that lists what changes have been made similar to a patch log? Please tell me they fixed the multiplayer crashing issue.

With this year's changes of GOG's user account area, there's now often a changelog in the gameshelf's drop down menu (just look under "MORE"), but unfortunately it's still missing for Dungeon Keeper. Afaik there have been no major updates to the game mechanics for quite some time, but mostly updates for GOG's installer. However, in early June, several language were added to GOG's English only version (audio and text: German, English, Spanish, French, Dutch. Text only: Italian). Multiplayer functionality is probably still the same as your version.
Just in case you don't know it yet, there's an extensive community patch/mod for Dungeon Keeper called KeeperFX, that solves lots of problems. Give it a try to get your multiplayer games running more stable.

Thanks DeMignon,
Is FX similar to play to the original?

Yes it is. Of course there are some tweaks (check their page for details), but basically it's still the same game.