When i launch the game, the screen changes the resolution to fit the game, but then nothing happens, the resolution retores to original, and that's it.

i tryed the support link, both from the app and from the website. None load the page.
I tryed "contact us".. same problem...

very good experience for my first game here..

Use opengl wrapper (read instructions). Game is nearly unplayable without it on modern systems.
https://www.moddb.com/games/disciples-ii-dark-prophecy/downloads/disciples-wrapper-v160

Game work normally (not perfect but that almost not noticable). GOG version already come with wrappers and work PERFECTLY.

But GOG Galaxy version of ROTE broken. And they remove entirely older builds from ROLLBACK (even from private publisher branch builds). Many issues. Main is they lost empty folders SoundP MusicP and SaveGames. Another main they lost their GOG DX Wrapper.

DisciplesGL is not a wrapper but whole mod. Main feature is not compatible but make it work only-windowed (borderless fullscreen or normal), speed hack+AI speed hack and widescreen hack.
It is resolve Win8+ issue with game speed that noticable only if you remmber how game work on <Win7 or if you play in windowed without wrappers (indowed modes solve Win8+ for all games). But any version on any Windows with any settings should at least start. With pink textures and 2 FPS but start.

Otherwise ot is common security Issue of Windows (since WinDP) to silently randomly close random game's, or incomplete installation (validate it in Galaxy or reinstall from setup file). For Galaxy broken install always incomplete. Although they bring back DLC content for it (still miss Impire map for Empire).
For ROTE game combine it with offline backup build (it is still working build from 2019).

Steam version still have more content (and issues Valve bring in '14). If you have it you can combine with GOG+Galaxy stwam too (content from steam vpk archives).

GOG version does not work perfectly for vanilla game, you need the wrapper for modern PC's.

Thanks so much! Works for me on windows 11 at 3840x1080 32:9!

Again. Game did WORK. On modern Windows too.
GOG version already come with DX wrapper and work PERFECTLY.

This is neutral facts. You cant argue with fact game already come with wrapper. You can say it didnt work for your syst3m cause of something on your end.

GOG Galaxy version of ROTE indeed kinda broken and miss GOG's DX Wrapper. As well as two empty folders (you cant save game without SaveGames folder). That update happen half a year ago. Restore two folders you get working version. Copy wrapper from Disciples 2 installation make game work perfectly again.

If it comes with a functioning wrapper then why do I need to install the moddb wrapper on the 5 computers I installed the game on in order for it to work?

Because you did same steps to setup systems on those PC? All Galaxy and games clients in same Program Files folders? Galaxy and games should be on non-system drive. With 3rd party security applications Games folder should he in exclusion (W.Defender less paranoid for ./Games/ and admin run mode).

In any way Galaxy should be in admin run mode to download and VALIDATE by you game files. Always do validating after downloads.

Because you maybe set 1280x1024 wrongly think it is maximum. Maybe wrong refreshrate (i guess only 60hz for x768).

And again. In case if you use GOG Galaxy and galaxy-version it is indeed broken (applied to ROTE only).

Silently close games very next after their launch is common general Windows issue. That for someone happen even before Windows 8. Its NOT a compatibility issue and happen with any game any years on many variations of Windows. With that variety i cant say what the issue, never see any solutions except admin rights/security exclusion or reinstall/reinstall+validate. Most times there such asks for help remain unanswered or OP did not answer did he try something and did it help.
Some threads OPs told they find some 3rd party thing to download without trying original issue solving (even if there is advise) and after spread mis-information "hey it did solve for me so it did work, game didnt!". Say it as a fact thing. The only fact is they - and you - didnt try solve it for clear game. And make assumptions based on what you didnt, not what you did. Of course clear game didnt, changed did worked! You make it. Then put it as guide. Th3n someone did it by this guide. And keep saying it is correct even have no idea how things work and what exactly you put into game folder. Eg many times on internet you can find WRONG suggestion of use Windows legacy versions compatibility option. Should be used rarely. Many digital versions are not compatible with original Win98se2/Me. Another fact, which ppl ignore keep telling downloading cracked exe and compatibility did solve issue. It did because its what they did. Its not fact alternate solutions didnt exist, including for UNCHANGED clear game.

DisciplesGL never be a mandatory to run D1/D2/D2ROTE. Whatever trash mobile-backported nowadays Windows (and worse for their updates) - they able to start this games. With some issues (very slower than its should be) but its work. GOG did win10 update back in 2019 to solve slowdowns issue. This year they broke it back for one of their builds (and they erase ability to rollback in Galaxy, even for private dev branch).

Copy ddraw.dll, dxcfg.ini and dxcfg.exe from Disciples 2 to D2 ROTE (as well as SoundsP/MusicP/SaveGames folders).
Or do not copy them and keep DisciplesGL.

There is also a chance, as very many people really do, you mess "not working/now working" with "working worse/now better". DisciplesGL as a wrapper-mod (wrapper-patch as author call it) obviously have more features than else things.

Its a matter of facts. Games/Windows work - fact. There is build-in win10 wrapper - fact (for 3 of 4 versions from GOG). DisciplesGL do a better job at cost of very few changes/limitations - fact. 1 of 4 builds are broken - fact.
Any else is personal experiences.

Many people mess personal experience and even many times opinion with facts. Many ppl can say instead of "4:3 game didnt work in widescreen as i want it" -> "nothing worked!!111".

You enforce on me your experience on 5 machines. Its still your experience. Another matter of fact - people this days on Internet ignore facts and arguments. And many times arguments which i did use here can be called personal opinion arguments. Facts is not opinion, opinion - not facts. Not all arguments are facts, but people didnt see the differences.
That lead to blindness sometimes. With just statements game work itself (Windows OS did work correctly say) and GOG version have wrapper included i get blamed to promote it and personal opinion disliking DisciplesGL. While in truth i do suggest use it (if you understand differences what is what and why for).

I did on 3 machines and 3 differ OS and its worked. With no special tweaks. Just usual tweaks. I did those tweaks. Because even console gaming are not "One-click" gaming. On one machine i have multiple installations of Disciples (Retal 4 cd with GOG exe, and even those "broken" from Steam) games, with differ wrapper and without any. This is argument but not fact. How many remain personal experience for both of us.
How many not working not matter if there is one where it did. I mean to find out did it work or not. How many related to trouble solving.