yeah you you need to install the ubi soft launcher, i think that is automatic when you install star trek. but you need to "purchase" the dlc. Its a free cost title.
with rift you have …
if your playing from from the quest it should be automatic.
if your playing from the rift you have "purchase" but it should be free, the dlc pack.
are you getting the prompts when you put on your headset?
when you plug into link look in the headset
it should ask if want connect to device as storage
it should ask if you want enable link
Like I said, it's not easy if a game doesn't have cloud based saves.
I don't even they that storage is formated the same from quest 1 to quest 2.
Otherwise try to follow this https://support.oculus.com/609566816377728/