AFAIK, you have two activations for each license key, after that the counter has to be manually reset in Parallels servers, you'll have to ask support/file a ticket to ask for the counter to be reset, or maybe some of the Parallels personnel will see this thread and send you a message.
"The Parallels End User License Agreement permits one copy of the software to be activated by a single license key on a single computer."
You'll see in these forums a lot of threads about the same issue.
Last edited by a moderator: Aug 6, 2014