This error typically occurs when the Kepware installer cannot verify the digital signatures of its own installation files because the host operating system is missing essential . This is common on systems that are offline or have not received recent Windows Updates. Quick Fixes
If the problem persists after trying the steps above, contact PTC Kepware support with the installer log – they can provide the exact thumbprint of the required root certificate for your product version. root certificates This error typically occurs when the
certutil -repairstore my
certutil -repairstore root
certutil -repairstore ca
certlm.msc as Administrator.Trusted Root Certification Authorities > All Tasks > Import..CER file into the Local Machine store (not Current User).