Haven't played this in almost a year, so I forgot how to update? using pc;

nevermind. I found an old comment that said, "if you're playing on pc or mac you don't have to worry your save won't move when you uninstall or update the game"; looks like only android has to keep the save file manually

Already have all the characters unlocked, I'm waiting for the two new characters, but it said available on DLC.  What does that mean?

do you have to buy this game if you want to complete the "declare your love to villager" mission? or demo also can