No way to progress without flu minigame.
I may have a way to get the changes I made to the minigame in 0.8 into your 0.7.x version. I don't know if I got all the bugs, but there should be fewer. I also don't think easy mode worked for this minigame in 0.7, but it should in 0.8.
https://mega.nz/folder/pS4HVTZD#yU9PLAQDmX2HsUuQqQQLKA
Place map138.json into your www/data folder (and overwrite what's there.) Place PROX_Minigames.js into the www/js/plugins folder (and overwrite.) You may want to back up your old files first.
This might not work at all. Or it could cause unforeseen changes, since I'm not sure these capture everything I changed about the event, but I think it'll probably be okay. In either case, I'd probably load from a save before you entered the building the first time.