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.
This problem is most prevalent on older Windows versions like and Windows Server 2016 , which do not have up-to-date root certificate stores. Over time, Microsoft has moved to stronger security standards (like SHA-256), and the root certificates on these older systems haven't been automatically updated, creating a kind of "trust gap" for newer software.
To resolve this issue, follow the steps below in order of preference. Discussions on the PTC Community suggest that while
Navigate to the folder containing your Kepware installer executable.
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You can download the "DigiCert Global Root CA" from the official DigiCert website. Install the certificate:
. This is common on systems that are offline or haven't received recent Windows updates. Quick Fixes Apply Windows Updates To resolve this issue, follow the steps below
I can provide direct links to the specific certificate files you need based on these details.
If your Windows operating system is not fully updated, or if it is completely disconnected from the internet (air-gapped), the system cannot verify the digital signature of the installer. Install the certificate:
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Look for entries like these:
