For anyone else doing this, I have created a script which, when run as a startup script in a GPO, appears to work for us: Computer Configuration -> Policies -> Windows Settings  -> Scripts -> Startup REM Get the folder from which it was called SET var=%~dp0 ECHO "%var%splunkforwarder.msi" REM Install the MSI MSIEXEC.exe /i "%var%splunkforwarder.msi" AGREETOLICENSE="yes" DEPLOYMENT_SERVER="server:port" SPLUNKUSERNAME="username" SPLUNKPASSWORD="password" /QN If you run this script with the latest splunkforwarder.msi in the same directory it should install or update as appropriate. ... View more

I tried following the instructions linked but have failed to upgrade successfully. I am upgrading from 9.0.4 to 9.0.5 using a (startup) script with one line: MSIEXEC.exe /i splunkforwarder.msi AGREETOLICENSE="yes" DEPLOYMENT_SERVER="servername:port" SPLUNKUSERNAME="admin" SPLUNKPASSWORD="password" /QUIET However, nothing happens when I reboot the server and it stays at 9.0.4. Running the command in an elevated CMD it doesn't appear to do anything either. If however I remove the /QUIET it then runs through the installation (interactively) without any issues and upgrades to 9.0.5. Please can you advise if I'm missing something to allow it to run non-interactively using the /QUIET flag? ... View more