Nebulb uses information from the hardware of the computer on which it is installed to control that the same license cannot be activated on more than 2 computers.
That said, there is no problem if you renew one of the 2 computers on which you have Nebulb installed (or even both) and install it on a new computer. This is a very normal thing that is done very frequently.
To do this, simply send an email to email@example.com indicating that you want to change your Nebulb license and we will release the computers associated with your license so you can install Nebulb again wherever you want.
It is very likely that in the future this process of “resetting” the license will be integrated in Nebulb (so you can do it yourself), but for the moment we manage it this way.