Ruby error

[BadassCecilius]

When I try to unpack UMBRA I get this error.

I don't have RUBY installed, I dont really know what is it, and when I found this ruby 2.1.9 (https://www.ruby-lang.org/en/downloads/releases/) It was like a bunch of files with no instalation process.

The error:

C:\Program Files (x86)\Steam\steamapps\common\Wolcen\Game>wolcen_extractor.exe extract --source "C:\Program Files (x86)\Steam\steamapps\common\Wolcen" --dest "C:\Program Files (x86)\Steam\steamapps\common\Wolcen\Unpack" --only "umbra.pak" internal:gem_prelude:1:in require': cannot load such file -- rubygems.rb (LoadError) from <internal:gem_prelude>:1:in '

What to do?