This is not a “password” but your unique license identifier.
Unlike modern subscription-based software, FlexiSign Pro 10.5 often requires a specific tied to your hardware dongle during installation. Flexisign Pro 10.5 1 Password
Are you trying to or password for an existing installation? This is not a “password” but your unique
Where exactly is the appearing (e.g., during installation or at startup)? Are you getting a specific error code ? Flexisign Pro 10.5 1 Password
A previous user set a password within the application preferences.