Validation For Rhinoceros v5

Hello,
I have problems during the validation rhinoceros v5, when I have installed and validation of data input as indicated, there is a message "An error encountered during license validation: Your license has been validated too many times and can not be validated again."
Please help me to solve thic case,

Thakns,

Just send an eMail to sales@mcneel.com to get this solved.