Trouble when file path contains spaces

Please excuse if this should something obvious, because I am not used to python and linux scripts. I installed BPSRender from Github with the PowerSequencer as an Add-On in Blender but the script folder was just empty.

So the next I did was to install it directly from cmd as admin with pip. Here is an image of the ERRORS I get with every blend-file I try to proceed as ADMIN. Do you have any hint?

Regards Daniel