Since you never had the 1.33 patch, you don't have to worry about that potential bug.
Just install the patch. There are some story fixes and updates that only effect new games, but it is not worth re-doing a large chunk of the game for that. Even without the patch's story fixes, there are un-official fixes or work arounds for most problems, should you even run into one. Don't use your teleporter stones to get into the castle before you have an invitation, and I don't think you can encounter any major un-fixable story problems.
