Hi, i've just got Disciples II and the ga,e works fine and smoothly, just the problem is that, i cannot save the game. While ending my turn in the bottom left corner a massage appeares "AutoSave
Failed to save"
Also when i try saving manually the same message appears "Failed to save". Any ideas how to sort this problem out? Please help. Thanks in advance

I'm going to go on the assumption you are using vista and installed this into the programs files folder. If so what you need to do is uninstall the game and reinstall it to a different directory not in programs files. So something like C:\games\disciples 2. The problem is that the game is trying to save information into the programs file folder where its located and vista can have problems with games doing this.
If this doesn't solve your problem could you also post your system specs?

Glad you got it working.

Create new folder "SaveGame", it helped also for me on WIN11.

If there one missed folder - there is more. And since thread from '09 when no Galaxy - your system fault even for offline GOG version, not only for GOG Galaxy. Ofc it did work properly in '09. You can find torrent with oldest setup files and check yourself.
That's maybe non-usual way to extract and bug from 3rd party extractors. Or non-GOG version (incl disc incorrect ly mounted). That's most likely issue for players try install it on Linux and MacOS. In that case use more correct/up-to-date extractors - there is ones able to do it properly for GOG v3 installers (innoextractor require -G extraction argument))

For GOG Galaxy you must validate games after downloading. Normally Galaxy create empty folders. Somehow (at your system end) it won't created. There is more empty folders should be there for Disciples 2 (and another game ROTE). Make validate twice in a row. Real GOG issue here is that they remove validation reports from Galaxy after some version. Galaxy always do something and never tell what. To make sure second download was correct validate again.

For GOG version (not Galaxy) you must reinstall it or re-extract. If one folder was missed - there is more folders and files missed too.

Any version and Ofc Galaxy itself should be reinstalled strick to D(x)\Games\Game-name-2\ eg X:\Games\Disciples-RotE\
and D:\Games\GOG\Galaxy\ (but games itself to Games, to reduce game path).

Short Latin path, non system logic disk, not disk root, no program files (even on non system, Win or 3rd party AV apply additional restrictions just by folder name), no spaces, no "_" (use minus), just Latin letters and just digits, no special symbols and umlauts, no non-latin letters. Or installer can't fail it, extractor, or security services apply restrictions.
{C\D\}\Downloads (or any else names except Games?) Also should be avoided. This folders is "user-space" download folder but since it is downloads - Windows and 3rd AV apply restrictions as well.
They detect that by folder named and-or path. Same supposed to happen for installators - Win should detect it as setup file and ask for admin (incl by setup- name, even if this exe was not setup but just renamed exe). 3rd party AV vice versa can apply additional restrictions by exe name or folder it placed.

Thank you very much!
Wish I had seen this before loosing 3h of a hotseat with my friend..

Creating the "SaveGame" folder in my Windows 11 installation solves the problem. Also, I turned on Direct3D to make the game works

If you mean GOG Galaxy version and not just GOG (offline) version, you first need validate game installation. Then create (again) not only SaveGame folder but also MusicP, SoundP folders. For GOG-Galaxy build their missing too.