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Hey!!! I managed to install everything using trial and error, but there's a problem. Let me explain what I did...
1) First, install SoD (everything is done in a folder with a Latin name).
2) Then, install WoG 3.57 on top of it (it's a paid version).
3) On top of WoG 3.57, install WoG 3.58 (it won't install immediately, of course... there will be a lot of errors and file corruption messages. But after this installation, a WoG 3.58 installation file will appear in the WoG 3.57 folder. Click on it, and WoG 3.58 will install without any problems or errors. Even if you forgot to add the localization files, you can click on the installation file again, and it will install everything, including the localization.)
Everything works for me... but there's one problem. I play, I save, I exit the game, I start again... everything is normal... but as soon as I turn off the computer... after turning it on and trying to launch the game, it says that the Heroes3 file is not a System32 file and will not be launched... I have to reinstall everything from scratch. Maybe I have a virus... besides Heroes, Download Master, Arom Switcher, and CDex (programs) also don't work. So, what's the truth here? Did I install something wrong, or is it a virus?
Firstly, if WoG 3.58 is the full version (about 40 Mb), then you can install it directly on top of SoD, not 3.57.
Secondly, it seems that SoD only works for you when the disc is present. In this case, it is best to download patch 3.2 from the files section, which allows you to launch the game without a disc. There might be something wrong with your operating system.
Also, a registry file might be useful for Heroes.
Thirdly, WoGa has its own file for launching the game, h3wog.exe. Launching the game with the heroes3.exe file is not possible for me.