FortiClient 6.0.8 installation failed - error status: 1603

Hi!

We have Windows 10 x64 Enterprise and we want to deploy the new FortiClient VPN 6.0.8.

On some clients we have the version 5.6.6, so I'm using the batch file to uninstall it and install the new version.

This is the code:

@ECHO OFF

msiexec /x {92CBFA29-7A5F-4EBF-8EB1-627FC3DBFA7C} /qn /norestart msiexec /i "FortiClient.msi" TRANSFORMS="FortiClient.mst" /qn /norestart

EXIT /B 0

But it's always failing. I tried also to run this batch file as admin manually on the client, but I'm always getting the error:

Windows Installer installed the product. Product Name: FortiClient. Product Version: 6.0.8.0261. Product Language: 1033. Manufacturer: Fortinet Technologies Inc. Installation success or error status: 1603.

When I run the MSI manually, the installation is working. But we need to deploy this on about 3000 clients over SCCM.

Any idea what else I can try?

Thanks!

Regards!