The license manager will warn you when it detects multiple simultaneous instances of MyEclipse running that share the same subscription information. We have accounted for most typical use cases and plugin developers but there still may be a case where you are running multiple copies at the same time and receiving an error. If you cannot work around this limitation, please email subscriptions@genuitec.com with a description of your problem and reason why you would like a more flexible license. We are always willing to work with our customers.