Oh no, I did get that. Hence my answer. There is no way to "Add" space to an SD card. Not unless you remove items off the card (say other files, that are not related to the game). However, that doesn't mean moving them off the card will give you enough room. There may just not be enough room on the card for the update, no matter what you do. If that is the case, it would require you have the game on a larger (more gigs) card.
Because, let's say the card is 16gb, which is never actually 16 free, and you said there is 7.35 free, that means 8.65 is being used. If it is "all" being used by the game, then when it wants to update, it "may" need enough room to be over double what the games size is now. This is because some games do more than...