With every purchase of a product from HOFA-Plugins you receive 2 licenses that can be used on different devices at the same time. All you need to do is activate the plugins on the second system using the HOFA-Plugins Manager, just like on the first computer.
If you notice that there are no more free licenses during the activation process, we would recommend that you deactivate all licenses once to avoid that activations are still assigned to outdated devices or operating systems.