V5 License only good for one machine?

Sorry if this info. is somewhere and I've missed it. I've searched a bit and also dug around some but can't find anything.
Used to be able to run my two machines in the house (one iMac and one MacBook Air) on one license. I tried loading the license into the second Hazel install and accidentally used the v4 license. No matter which one I now try to load I get a message about it being an old license and that I need to upgrade.
So, I could be at fault for accidentally loading the wrong license. If so, how do I remove the old one and install the new.... or, as I've questioned.... is it now a separate license for each machine.
Thanks....
Used to be able to run my two machines in the house (one iMac and one MacBook Air) on one license. I tried loading the license into the second Hazel install and accidentally used the v4 license. No matter which one I now try to load I get a message about it being an old license and that I need to upgrade.
So, I could be at fault for accidentally loading the wrong license. If so, how do I remove the old one and install the new.... or, as I've questioned.... is it now a separate license for each machine.
Thanks....