@smashman42 Adding in a versioning label and date to your "My Library" (it'll say what date the latest update is, maybe with a change log) is something on my list of things to implement.
For now, if it's something really important (missing content, major error, etc), I'll actually directly email everyone who bought the premium ebook about it.
Other than that, we haven't done too much beyond fixing a few typos.