As Pete would suggest, the Transport Case would be the best option (for moving lots of object between different AE version).
Normally there 3 options:
Import/export - folder structure is not kept / Cannot use for large amount of object
Transport case - (Not that the password of all user will be reset it default)
Client Copy - The AE need to be on the same version as stated in the documentation
So of the three normal options transport case would be the best. There is a white paper on this that mention the pro and con of each
here and some instruction on how to use it.