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BypassGenerationChecksum allows players with mismatching level generation checksums to play together. In particular, this mod should help players with certain AMD FX CPUs in R2B4, R4A2, R4C3, R5D1, R6D3, and R8E2. It should also help players with certain AMD Ryzen CPUs in Project Eternal.
If the host installs BypassGenerationChecksum, then nobody else has to. If the host doesn't, then the client(s) who are getting kicked out of the elevator must install it.
When the level generation checksums match, this mod does nothing; there's no harm in installing it. When the checksums don't match, instead of kicking the mismatching client(s) out of the elevator, this mod forces the game to ignore the mismatch and start the level. This carries some risk of strange bugs, so a red "Generation checksum mismatch!" warning is printed in chat.
The level generation checksum exists to make sure everyone in the lobby is experiencing the same level -- tiles, resources, enemies, objectives, etc must spawn in the same place for everyone. Certain CPUs produce incorrect checksums in certain levels, and I don't know why this happens. I presume that the mismatching checksum is due to a slight difference in the level generation, but it's also possible that the level generation is fine and it's only the checksum that's being miscalculated. If the latter is true, or if the former is true but the level generation differences are minor enough that they don't affect gameplay, then bypassing the generation checksum effectively fixes the problem. On the other hand, if the level generation differences are significant enough to cause game-breaking issues, then this mod is all but useless.