License "Expiration"

I received this notice in my email:

“FLUIDIMPORTER PRO SUPPORT WILL EXPIRE ON Thu, 09 Feb 2017
Your FluidImporter Pro support is about to expire. After Thu, 09 Feb 2017, your current version of FluidImporter Pro will continue to function, but you won’t receive any more updates. You can upgrade before the expiration date at a 50% discount and keep receiving free updates:”

Since my license is only one year old, I assume that my Fluidimporter license requires annual renewal. I did not realize that the license is only a subscription.
I don’t support subscription-based software so I won’t be “upgrading”