MZ-Tools 8.0 for VB6 higher than 8.0.1.2783 doesn't support Window XP or Windows Server 2003. So:
- If you are running on a supported Windows version (Windows 7, Windows 10 or Windows 11) and yet you get that error, ensure that the setup is not running in compatibility mode for Windows XP as explained in the help file.
- If you are really running on Windows XP or Windows Server 2003 (and you can't upgrade to high versions) then stick to this setup 8.0.1.2783 and disable the Check for Updates setting:
https://www.mztools.com/previousversions/8.0.1.2783/MZTools8VB6Setup.exe