There is no error I just don't have full paid version on the backend and on front end, it has the "Joomla SEF URLs by Artio".

Just to recap:
Old site: africaa-z.co.za was on paid version 3 - valid till October 2014 (Joomla 1.5)
New site: africaaz.com is on Joomla 2.5 (did a fresh install as had previous errors on old site that I wanted to get rid of so manually added all the pages on a NEW server!).
These are duplicate sites (so both hosted now on same NEW server). The old server is no longer hosting the .co.za domain.

I bought the upgrade package (37079) and then realised I had changed the primary domain so bought the Product Registration Change now (37105).

NEW server Artio is using version 4.5.2
When I upgrade, it says "The Download ID set in configuration is not valid. You will obtain the non-paid version of JoomSEF when launching upgrade from ARTIO Server."

Hi,

Make sure that you have entered the correct Download ID for updated JoomSEF 4 (the one starting with 8bc7...).
Then make sure that you have at least once downloaded the installation package from our website www.artio.net/e-shop/download-area using your download ID - that's how you activate it.

Thank you - that has now worked.