I've been going through a big collection of my old edutainment games, and I have V 1.01 of this one (to be submitted via new dump form). It's titled "Capers on Cloud Nine", not "Adventures on Cloud Nine". I can't find any other references to the title "adventures on cloud nine" apart from that one entry here on redump, while capers has a wiki page and lots of other results.
This ebay listing gives a serial number of 380811 for it, which matches the number on both my disc and the dumped disc.
I'm guessing this was just a case of absentmindedness, since I find it unlikely that this game went by multiple titles. I obviously can't prove that it doesn't exist, though, and the dumped one is V1.0 while I've only been able to find images of V1.01.