Re: How to upgrade save to 1.1 without starting over?
Not that I am aware. The devs are working on a hot fix though. Also there are console commands to open at least some of the not functioning doors, that's what the devs posted concerning these commands:
Sorry for the problem with locked doors for save games started in 1.0 version (Cheznaddar - Hatmandor sewers and caves near Bayan).
It will be fixed by hotfix. Until it is released you can unlock this doors by following cheat code sequence:
ec.setattribute llvl 0