Thanks everyone for responding.
I bought Fences 3 as a stand alone product at the time. It is a bit strange that after updates I can no longer use my older version, no updates ok, I can live with that. But I should still be able to download the software.
So it means I can no longer use Fences on my new computer. That is a shame.
The reason I don't want to buy the 4 is because I'm still very happy with fences 3, all the extra "stuff" I don't need and won't use anyway.
Unfortunately, maybe in the future I'll buy fences again but for now I'm going back to old school tidying up my desktop