This is exactly why I am no longer using Parallels. While Parallels is probably a superior product their licensing policy caused me to move to VMWare Fusion. I have 5 Macs in my household. 3 of which I need to run Windows or other VMs on. Parallels requiring a single license per computer is costing me $150/upgrade. VMWare allows one license to be installed on as many computers as I own as long as I am not installing it in a business environment costing me $50/upgrade. I used Parallels from Version 3 all the way through Version 9. I would love to come back to Parallels but as long as it is costing me 3x as much I won't be. I have written to customer support several times telling them this and have only gotten "we will pass it along".