PokerTracker

I'm looking to buy pt4 for both my desktop and laptop, but since my desktop is quite old I'm probably going to replace it soon. On the site it states two computers at the same time, is the meaning literal on does it mean I can transfer the license between computers as long as the current amount of computers using it is 2 or is it 2 computers per license in total?

As long as PokerTracker 4 is uninstalled or no longer used on the old system then you can use the same registration code on your new computer. The PokerTracker license grants simultaneous use on two different machines and you always get to pick which two, even if it's not the same two you started with.