Deploy "fails"...but works?

I’m currently testing the process of deploying PDFCreator through SolarWinds Patch Manager (this uses WSUS to push third-party updates), and I’ve got the current odd behavior:

If I deploy 1.7.2 to a PC that does not have PDFCreator installed already, Windows Update claims success, and everything works.

If I deploy 1.7.2 to a PC that has 1.7.0 (for example) installed, Windows Update complains of a FFFFFF9C error and says that the update failed. However, the update clearly worked and runs as one would expect it to. The only issue I can see at all is in the log file I had the installer create:

2013-12-18 10:30:34.346   Failed to remove temporary directory: C:\Users\(username)\AppData\Local\Temp\is-OO7IK.tmp

If that’s the only problem, how can I get Windows Update to ignore the error? Or is there a way I can enable the installer to delete the temp file so that everyone will be happy?