Web PI Installer Signature verification failed on downloaded file

Hi 

I have a process where in I generate the new feed file when new installers are ready. But if I have already included the generated file once and try it next time with newer stuff it gives me error - Signature verification failed on downloaded file . I notice in the log file the path mentioned has wrong sha value.

C:\Users\<username>\AppData\Local\Microsoft\Web Platform Installer\installers\qqApp0\993EE5BAF44D68B3B8533703C511C91EBD9C4FF1\service.zip

993EE5BAF44D68B3B8533703C511C91EBD9C4FF1 is not correct sha value.

I removed C:\Users\anjna.khanna\AppData\Local\Microsoft\Web Platform Installer and also did webplatforminstaller /reset from correct path.  Nothing works

AK