Modern software installers use digital signatures to prove they haven't been tampered with. Kepware uses certificates issued by authorities like or Sectigo .
Obtain the missing root certificates (often from a machine that has them or via PTC support). Right-click the certificate file and select Install Certificate Local Machine as the store location. Manually select the Trusted Root Certification Authorities Check Firewall/Internet Connectivity Modern software installers use digital signatures to prove
Discussions on the PTC Community suggest that while manual installation works for some, others may need to contact support for a specific "root certificate pack" if they are on an unsupported OS version. Re-run the Kepware installer
: If the error occurs post-installation during connection, use the OPC UA Configuration Manager Re-run the Kepware installer.
By following the methods in this guide—especially the for air-gapped networks—you can bypass this roadblock in minutes.
Re-run the Kepware installer.