I believe we are permitted two (somewhere I read three) computer installations. I installed it on my laptop without too many incidents but when I tried to install on my iMac, I got the message that the installation code failed. Is there a trick to this I don't know about? Or do I need to pay for another license?
As this is the Extension Manager forum, can we confirm what application you are referring to? As it does not sound related to Extension Manager? Also, if you can send a screenshot that would be appreciated.