There is a link to all of the legacy skins at the bottom of the
jAlbum Software > Previous versions page, linked in the menu above. But use of the obsolete skins is strongly discouraged.
The reasons for their removal are many: instant crash with current jAlbum, Flash albums (not viewable in any browser), layouts that use framesets (deprecated, and a disaster on mobile devices), designs that no self-respecting site owner would want to trot out these days, etc.
Which current skins are "most like" the old ones? Well, none of them, which is kind of the point. Which currently available GM product is most like a '73 Chevy?