Quoting yolandanelson2019,
I had the exact same issue. I have Fenses 3 and then today it updates without any prompting from me. Now it tells me that I have to buy version 5??? This seems quite shady business practice to me too. Even though I was willing to buy version 4 (if it has a permanent license). I think the permanent license for version 5 is a ripoff.
I'm not sure about OP but I have way too many Fenses on my desktop to uninstall and reinstall.
There is nothing nefarious intentionally being done here and it's still not clear if it was a 'prompt' or an email that was sent that was soliciting that you upgrade.
As I asked in my prior response, you can uninstall Fences 4, reinstall Fences 3, and activate it with the keys that you have. If anything 'pops up' or offers you any form of update, screenshot it and post it in a reply here please.
Sean Drohan
Stardock Product Lifecycle Manager