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For historical reasons, Windows is installed on W: on my computer, and I normally don't have anything mapped to C:. Galaxy 2.0 installer crashes immediately on startup if there's no C: present:

GOG_Galaxy_2.0 (1).exe caused an Unknown [0xC0000409] Exception at location 0000000000457DA3 in module GOG_Galaxy_2.0 (1).exe.

eax=00000001 ebx=0019f00c ecx=00000007 edx=000001e2 esi=00000000 edi=00000000
eip=00457da3 esp=0019ef08 ebp=0019ef38 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000202

AddrPC Params
00457DA3 0019EFDC 74C3A890 0019F00C GOG_Galaxy_2.0 (1).exe!0x57da3
004342F0 0019F00C F699BE3C 00000000 GOG_Galaxy_2.0 (1).exe!0x342f0
74C3A890 0019F00C 770F6312 0019FFDC KERNELBASE.dll!_UnhandledExceptionFilter@4
771228E8 FFFFFFFF 77108F15 00000000 ntdll.dll!__RtlUserThreadStart
770E7B44 005C61E0 0022D000 00000000 ntdll.dll!__RtlUserThreadStart@8

If C: is present, the installer creates a log file in C:\ProgramData\\Galaxy\logs\InstallerBootstrapper.log . Galaxy 2.0 itself seems to run fine without C:.
Post edited January 26, 2020 by jernejs