By Click Downloader activation key is not working, it is usually due to one of three reasons: the code is lost, it needs to be reset for a new PC, or it was entered incorrectly.
Common ByClick Downloader Activation Key Issues byclick downloader activation key fix
Deactivate Old Devices: ByClick licenses are typically tied to a specific number of devices. If you’ve reached your limit, you may need to contact support to reset your "activations." By Click Downloader activation key is not working,