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I own the game on Gog.com
My friend owns it on Steam.

We both did a fresh install of our respective games and tried to play online together.
We could not do so because our games return different checksums.

Are there any known fixes to this issue?

GOG checksum is: 6F2D2F4
Steam checksum is: F390E2E6
Both versions are reported as 1.1.0b
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