Appreciate the replies all
However still making no sense
In my HOME tab in Knossos I see 2 entries which are FSO and FS2 Retail. In the EXPLORE tab I have all the available mods of which 2 have been downloaded including Blue Planet.
In the HOME tab, clicking on FSO doesn't offer any PLAY options
In the HOME tab clicking on FS2 Retail DOES offer a PLAY option and if I take it FS2 runs but says I have no campaigns. One of the options at that point is to go to the in game campaigns screen and in there, there is nothing, not even the main FS2 campaign.
That might be because I have now begun playing the original FS1 Port Mod using WXLauncher, don't know.
Regardless, how would I use KNOSSOS to play Blue Planet ?
It doesn't appear in that HOME TAB and in the EXPLORE tab is just has the basic options of Install, Details & Cancel