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This was flagged as updated today. I downloaded it and was copying it to my backup drive when I noticed the version numbers. The files I have backed up are version 2.0603.0666c. The "updated" version released today is 2.0508.0677. There is no change log, so what's up?
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This update is about adding a long awaited new content called Rat Tales.

This is what was added (according to the announcement post on steam)

Quoting:
- New events: Including a rat-centred tale, a Thea dating game and an invasion of foreign wizards and their flock.
- New Rat classes: Just when you thought there’s enough rattiness in Thea, we give you the Tsarat, the Warrant, the - Healrat, the Mystrat, and a cute, little baby rat!
- New Human class: The Berserker, a wild warrior whose power is gained from Destiny.
- New Dwarven class: Ever wondered what dwarven women do in the depths of their underground kingdoms? The - Matrioshka answer that question and show just how powerful they are.
- New characters that can join your group: Gnolls, Polar Bears, old magicians...
- New pets to discover; eight new additions to our Thea menagerie
- New god Trait cards
- The Memorial Grounds: Finally, the many deaths and/or abandonments of Thea’s heroes are now recorded for posterity.
Also included in the update is an important fix to the multiplayer mode, so now you can enjoy Thea 2 with friends again!

As for the build versions: this build version changes were also done before. You can check it here:
https://www.gogdb.org/product/1582025844#builds
I just installed for the first time and nothing is working; this version upgrade seems to totally break the game