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What is the latest version of this game? In my GOG client it shows that I have 1.08(HOTFIX2) installed, but for some reason I found in my downloads folder two files named:

setup_rebel_galaxy_2.6.0.11.exe
patch_rebel_galaxy_2.6.0.11.exe
setup_rebel_galaxy_1.08(hotifx2)_(23097) - you should have these. Maybe galaxy doesn't automatically updates the offline installers, or just applies the patch.