If you own the dongle and serial, follow this correct procedure:
If your production computer is not connected to the internet:
If it is so dangerous, why do thousands search for "FlexiSIGN Pro 10.5 password key" every month?
Searching for "FlexiSign Pro 10.5 password keys" on the open web often leads to malicious sites. Users should be aware of the following risks: Malware and Viruses