hrmm, you may want to check your account, you are only allowed a certain amount of installs per software - so if you uninstalled it but the reallusion servers didn't register the uninstall - it counts as 1 install. In your account registration page, there is a list of how many open installs you have with the software - you can disable 10 times until you have to email support for helping reset these numbers. so technically you have 15 installs if you count the 10 you can unregister yourself.
It's just a security device they have against illegal installs - ie - someone having your password and taking one of your installs without your knowledge.
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"To define Tao is to defile it" - Lao Tzu