The-Witcher-3-Mod-manager
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[WinError 123] The filename, directory name, or volume label syntax is incorrect

Mod manager installed in: D:\Games\TWR3_Mods witcher.exe D:\Games\TheWitcher3\bin\x64
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To make sure, this error appears while trying to install a mod? Would you be able to run the source version with python directly and see if a more detailed error description appears in the console?