I believe you mean Start11, yes? Start11 if purchase individual its one time payment for use forever. You just need to purchase new license if Start11 do an upgrade in the future. Updates is for free. But, you can also buy ObjectDesktop which also include Start11 in it. Which also come with lot other Stardock Software. That one is yearly subscription base. More information on it here.
- Start11: https://www.stardock.com/products/start11/
- Object Desktop : https://www.stardock.com/products/odnt/
Stardock Community Assistant.