Every time I update Windows 10 on every machine, I have to reactivate Fences, so it is impossible not to pass any limit. Why does this reactivation need occur? And how can I get all my activations back?
Go to your downloads page at the Stardock Store. Find ObjectDesktop, click view product keys, and then click manage, deactivate all except the one you need.
In the future, deactivate this way or with the Change License option in Fences About.