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A proper solution would be:

1. just look for DevolutionX. (Github)
2. simply download it for your operating system. Unzip it somewhere.
2. copy the DIABDAT.MPQ into it and start it with devolutionx.exe.

Voilá! You now have (in addition to countless bug fixes and cool new settings) an integrated VPN (ZeroTier) in addition to TCP/IP. It couldn't be easier.

I hope it helps one or the other.