The error message typically occurs during the activation of ZKTeco software, such as ZKBio Time or ZKBioSecurity . It indicates that the User Public Key (UPK) file, which is required for offline or manual activation, is missing or has not yet been generated from the software. Common Causes
license upk not found
Warning: Only attempt this if you are comfortable with Windows Registry Editor. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Oracle\UPK . license upk not found
file is missing or the software cannot validate the hardware ID (MAC address) against the license server. Common Fixes Perform Manual Activation : If online activation fails with this error, download the from the official portal or your dealer and use the Offline Activation method within the software. Check MAC Address Changes The error message typically occurs during the activation