Yes, using this link you can download any version of JomSocial. Just make sure that you know exact version number you want to download, and replace it instead X.Y.Z.

http://www.jomsocial.com/component/account/?view=download&id=REFERENCENUMBER&email=This email address is being protected from spambots. You need JavaScript enabled to view it.&ver=X.Y.Z.