It would be better if they had a management system of our licenses associated to our online account, there we could have 2-3 licenses and the respective PCs, there we could remove old PC (or their identifications) then authorize new PC. This system is used by others like XLN Audio*.
This way we would be able to have a fast, problem free and intuitive way of have our licenses properly installed and have full freedom of PCs use (no more than 2-3 at a time). They may even have less work/expenses managing our accounts/licenses too.
Better even would be a Reaper like copy protection system

* for reference see http://www.xlnaudio.com/en/support-faq