In this article we explain the following errors that can occur when attempting to install GeoStudio or lmadmin.

Cause

• Some components of GeoStudio and Lmadmin are signed using a code signing certificate issued by a Certificate Authority.
• During installation, the setup components are verified and the root certificate must be available, otherwise the verification step of the installer fails.
• This error can occur in the absence of a connection to the Internet, a corrupted installer downloaded, or an inability to access the temporary working folder due to permission issues.

Steps to Resolve

1. Re-download the installer from https://www.geoslope.com/learning/downloads/alternate-downloads.  Wait until it is fully downloaded, and try running the installer again.
2. Make sure you are connected to the Internet and that setup is not blocked by a firewall, to allow the installer to download and install any required root certificates for verification.
3. Ensure all Windows Updates have been installed.
4. Download the latest root certificate updates from Microsoft, and install them manually. For more information please refer to Knowledge Base article 931125 from Microsoft: http://support.microsoft.com/kb/931125