For some reason, GOG version doesn't seem to be patched to the latest version.
For those of you who want to update your game:
http://www.owsupport.com/?sect=patches
Seems to be fully GOG-compatible.

Thank you very much.

The GOG version now has the patch pre-installed. The patches at the link will also screw up the GOG version to make it act like it's from some other site and ask you to buy it again. You can just reinstall it with the GOG installer to fix that though.

Which patch it is? 1.10b? 1.11?

GOG has 1.10b that website has 1.10b. There's a 1.11?

Yes, the beta one. you need to register in OWS forums and apply for an open beta test, then in a day or too you will be aproved and will gain access to the open beta-testing subforum.

GOG seem to be distributing a DLL Altar Games use as its DRM for there own online shop. This will confuse the patch into thinking that you have the Altar Games version, as such it will then overwrite the main exe with a version protected by that DRM instead of a non-protected version.
1.11 beta doesn't contain any DRM (Since its a WIP contacting Altar to get a protected version each time i make a change would be a nightmare). Note that while 1.11 beta is not a "finished" version it has been in production for over 1 year. As such its more stable than 1.10b and is recommended.

I guess I will stick with the GOG version for now.