chricton: I just re-downloaded everything available from the download page because it was flagged as having an update (but what was updated?). Anyway, I now have the following files (plus the bonus stuff I'm not listing here):
setup_outcast.exe
setup_outcast_2.0.0.13.exe
setup_outcast_2.2.0.19.exe
patch_outcast_2.2.1.20.exe
patch_outcast_2.2.2.21.exe

What is what? Since the game versions and the version numbering of the files are completely different numbers, could someone directly affiliated with the handling of Outcast available on GOG please, PLEASE, post a sticky describing what is what?

As far as I can sort out:
setup_outcast.exe is "Outcast Classic" (the filedate is the same as bonus content so this must have been from when I did the original download from GOG so I'm not sure at all about this)
setup_outcast_2.2.0.13 is ??? (is this "Outcast Classic" or does setup_outcast_2.2.0.19 supersede -.13?)
setup_outcast_2.2.0.19 is "Outcast Portuguese" ? (is this a Portuguese only version? the filesize is smaller than -.13)
How do these Outcast installers relate to each other?
(I don't know why GOG pointed me to a Portuguese version since my profile says English but oh well.)

patch_outcast_2.2.1.20.exe is "Patch 1.1.4.18786" ?
patch_outcast_2.2.2.21.exe is "Hotfix 1.1.4.18788" ?
Does -.21 supersede -.20 or should the patches be installed sequentially? Are these patches valid with all versions of the game installers or should they only be applied when using a specific game installer?