Genymotion Desktop licenses (paid or trial) can only be used on one computer, plus a spare.
Therefore, if you need to use Genymotion Desktop on a different computer for some reason, or if you have changed or re-installed your OS, you need to contact our technical support to reset your license activation.
For more details, please refer to this article: I get the error: "You have activated the maximum number of workstations allowed by your license"