How to downgrade G1R to 1.02

>!The 1.03 patch a few quests, 'New souls for the brotherhood' being one of them. Speaking to the digger in Brotherhood, the game freezes after you exhaust all dialogue options. You have to ALT + F4. Frost shadowbest doesn't spawn in in 1.03 so you can't complete that quest either. Beasts of Khornis II is messed up, if you choose to keep the gland, you no longer have the option to change your mind and give it to Cavelorn.!<

>!Overall several quests are basically messed up. The question is, how does one downgrade the game back to 1.02 on steam?!<