Sophos updating policy not set
The installation source for this product is not available.Verify that the source exists and that you can access it.' It exists and I can access it. (tried setting from the answer by @Evan Anderson, but it wasn't until I added this setting below as well that allowed the software to install.Antivirus software is one of the first things you should install on a new PC, and top quality protection can be yours completely free.
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When I reboot and log in again I simply get the same messages about needing to perform the update before the next logon. I'm rather new to deploying via group policy so what other information would be helpful in determining the issue? I'm able to install the MSI using the command line and msiexec when logged into the computer, so I know the MSI is working ok at least.
You're seeing the dreaded scourge of asynchronous policy processing.