Just tried this (DSS v5 demo to v6 Demo) & the volumes appeared to all be there, but no NAS or iSCSI configurations were, but upon re-creating the iSCSI Target, the data was available again. Next step is to license the DSS v6 Lite and see if all is still there again. Cheers.
Ok, thanks for no one telling me to RTFM!
It stated clearly in the 'readme_3530.txt' file that it supports previous DSS version volume and config info. Cheers.