You may face this problem when you are trying to activate the product using the license key that has already been used earlier.
Each license key can only be used once. After you successfully activated your license on one computer, you cannot use the same license key to activate it on another computer.
If you have a Floating User license and face this problem, then, perhaps, you have activated your license on one computer and are now trying to activate it using the same license key on another computer. There is no need to do this. If you have the Floating User license, you need to activate TestLeft on one computer only. This computer will become the License Manager PC and will control the use of TestLeft instances in your network. There is no need to activate TestLeft on other workstations.
You may encounter this problem if you moved the license to another computer and did not deactivate it on the previous computer properly. To move the license, it is not enough to uninstall TestLeft. You need to “unbind” your license from the current computer. For detailed instructions on this, see Deactivating and Moving Licenses.
You can also try resolving the problem by using the Licensing Troubleshooter on our web site: