I’m sure it will make it a lot easier for Warhorse Studios if those with the quest fail zip up their savegame plus profile and make it available to Warhorse. Obviously their testers somehow, missed this stuff?
To do this:
Go to your main drive (for me it’s C)
C:\users\yourusername\Saved Games\kingdomcome\
temporarily move or delete older saves so they can zero in on just the one that you want them to focus on. Then zip that entire folder, the entire kingdomcome folder and load that zip up on https://filetransfer.io/
Then send an e-mail to Warhorse support: support@kingdomcomerpg.com
In the subject put patch 1.4 and main quest failure. Then a brief description and the link for your upload. Please don’t be horrible to them. I’m sure they’re just as frustrated as we are.