Board Thread:General Discussion/@comment-71.60.21.82-20130121052227/@comment-7244170-20130414223747

No you can't it has to be purchased from him I hear about people glitching through the gates or jumping up to the ledge when you first enter with Serana. But, I tried and the ledge is far to high to jump up too and you can't glitch through the gates either. I spent an hour trying. However, I hear if you go vampire route you can calm the Dawnguard people to sell the other spells to you though, this doesn't make sense due to most of them requiring quests for you to actually get them into the Dawnguard. So I believe it's most likely you willl miss out on spells no matter which route you take just taking the Dawnguard route you only miss one.