I've asked about Start10 working on W11 a few months ago:
https://forums.stardock.com/505619/anyone-tested-start10-on-w11
But in the end you seem you are just re-releasing the same app so it must be bought a 2nd time instead of updating it to support W11.
Ok let's say the changes are too major worth of making a new product.
So i check the price and the discount you are giving and it's essentially 1eur; both apps are 6eur without any discount.
Let's just hope you will keep releasing updates to Start10 if microsoft breaks it in the future.
Personally i'm not updating to W11 anytime soon. Too many bugs, a lot more microsoft spyware, and 0 features worth updating too. Even directstorage is coming to W10 too.
Just letting you the rest know about this decision by stardock in case you have missed it.
Have fun