Jujujitsu: So I have looked thru a couple of walkthroughs and FAQs and can not find an answer. My game from GoG came at v1.3. I am at Anskram Keep and have three problems.

First there are two trap doors on the top floor by the dungeon entrance that I can not open. When I click on them, they move, but act as if they are locked? There must be a key somewhere that I have missed?

You get the key from the next town with a quest he gives you to weaken the defences.

Second, I have cleared the Keep and have used the lever at the two sets of wooden doors. Stepping thru them like a walkthru suggests .... but there is no demon and guards when I get thru. Not sure what I am missing here.

You missed clearing the rooms behind where the demon comes from or somewhere on the way.

Third, I need to open the portcullis. I have lowered the drawbridge already. I believe I need to use one of the above mentioned trap doors to get to the gate mechanism... but if there is another way?

Yes you need to get inside the trapdoor.

Anyways, thanks for any help you can give me. I have read that MM9 is buggy, hope these are not reload to an earlier save issues, but I did make a save before I went to the Keep... multiple saves for the win! hehe