Yes, I think that is the utility you have mentioned in the past.

Well, I like to do silent installations, and Adobe Flash would be the smallest and easiest I would think.

To install silently it is "FlasherInstallerName.exe -install"

As for UAC, I generally turn it off. Probably not a suggested configuration, but I find it gets in the way too often. However, in Win8, sliding the UAC bar to off, does not completely disable it. I would be interested in knowing if the scheduled tasks runs the installer silently, and completes successfully, with the UAC on the recommended setting, and with the UAC at the bottom setting.

Thanks.