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this comment:
Valerio Di Donato says:
August 21, 2016 at 5:43 pm
DRM-free build is coming!
We don’t have plans for OSX nor Linux at the moment, the first mostly because there’s no decent hardware where Redout can run as it should.

We don't know if this is a gog release, but at least it is a drm-free release
A DRM-free build is always good news! Let's hope GOG will get it!