Irina19
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The installer won't launch? Or, after installation, the .exe file won't run?
In both cases, you can try setting compatibility with Windows 7. There can be problems if "My Documents" are moved to a different drive (i.e., not the default system drive).
Second. It says: Files from Heroes III are missing. Please reinstall Heroes III. I set compatibility with an earlier version of the OS. It seems to have worked.