So if you have a steam version with adult patch already but from before the bug fix patch I think it's not too difficult to fix.
-download the rpgm decrypter tool here
https://f95zone.to/threads/rpg-maker-unpacker.50/ then unpack game and create a project file
- download RPG Maker VX Ace free trial that gives you 30 days to use
-Someone on the steam discussion page identified the problem with the side quests
The problem is in the script call in the event. They have quotes instead of brackets. The script call: t_w("Accepted Side Quest "A Blacksmith's Dream"") should be: t_w("Accepted Side Quest (A Blacksmith's Dream)")
I've managed to fix the first two side quests so far, but I've got zero experience with RPG Maker so I think I'll have to play thru the game to find the events that need fixing because the others are locked behind story progression. I'm sure someone who knows what they are doing could fix them all quickly.