Patch 1.2.4 fixes issues with the retail version. Retail versions that state version 1.2.4 on the CDs do not need this patch. Digital distribution versions are already fully patched.
For the Polish version use the ASCENSION PEAK patch.
Set 3dfx logo splash screen logo to off.
Use DirectX7 mode (see Widescreen resolution).
Play in DirectX6 mode.
Press Alt again. You can now move normally.