I am attempting to push out updates for Adobe products using SCUP but am running into a strange issue when clients attempt to install them.

The clients all see that flash player 11.9.900.170 is available and a required update based on the version currently installed, however when they attempt to install the update, UpdatesDeployment.log reports error 0x80240017 indicating the update is not applicable.

I thought maybe it was due to the version the clients were currently on (11.7.x.x) so I manually updated a couple to another version (11.9.900.117 then 11.9.900.152 when that failed) to see if that would make a difference, but every time it was the same result.

Has anyone experienced this/found a solution?

I have seen issues with the rules multiple times. Open the Flash Player package in SCUP and verify that the detection rules are correct.