I believe this update is all code changes, not anything that would affect data or story.
For Corbin Day, you can email your save (or a Dropbox or Google drive link, etc) after completing that quest, and before leaving Reaper's Coast, to supportdos2@larian.com. I can teleport him to the ship in the developer version of the game, which should get everything to work properly after moving to the next act. He can not be teleported to the ship after arriving in the next act, as he would not be in the level in order to teleport.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2\PlayerProfiles\<ProfileName>\Savegames\Story' folder.
In Windows Explorer you can zip file(s) and folder(s) by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.