So I've not logged onto this forum for 18 yrs

However - I'm trying to understand the cadence of releases for X3, and what the Humble Bundle is missing. It has X3-Rebirth, but doesn't include Reunion. Are they different games and is the Humble Bundle missing part of X3? Link to what I bought is here:
https://www.humblebundle.com/games/x-un ... ion_bundle
Anything that people can point me to that would fill in my 18 yr history gap would be appreciated

Thanks.