PC Check & Tuning licensies have a validity of 1 year. In 2020 PC Check & Tuning was advertised as a family license: with 1 license key one could optimize upto 6 devices (desktops and laptops). 
The 2021 version could also be activated on 6 computers with the same license.

Without any information upfront, it turned out that the 2022 version could be installed on 2 computers only with 1 license key. The price, however, is the same as in 2021 ($ 24,99). 
This decrease in functionality is information that should have been provided prior to purchase, because this information may affect the purchase decision.
However, you will find out about this reduction in applicability only after the purchase, when you try to activate your 3rd device in vain and finally contact the sales support department.