This error occurs when the Kepware installer cannot verify the digital signature of its setup files because the required are missing or outdated on your Windows system . This is common on offline machines or older operating systems like Windows 7 that haven't received recent security updates . Immediate Solutions

Download and install all critical security updates, then reboot the machine and re-run the Kepware installer. Method 2: Manually Import the Missing Root Certificates

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

Installing Kepware software usually proceeds without a hitch. However, a missing digital certificate can halt the entire process. This guide provides actionable steps to resolve the root certificate error. Why This Error Happens

Step 2.1: Identify and Download the Required Root Certificates

Once the system is fully updated, restart your computer and try the Kepware installation again. Method 2: Manual Certificate Import (For Offline Machines)

In some cases, the Secure Boot feature in the BIOS/UEFI can interfere with certificate validation during installation.