I could not install a release build in Flash Builder 4 using latest release of air installer package:
The following is the log of the install in Windows 7
[2011-07-12:12:15:51] Application Installer begin with version 18.104.22.16830 on Windows 7 x86
[2011-07-12:12:15:51] Commandline is: C:\Users\George\Desktop\XX\_XC\XCG\BGDB.air
[2011-07-12:12:15:51] Installed runtime (22.214.171.12430) located at c:\Program Files (x86)\Common Files\Adobe AIR
[2011-07-12:12:15:51] Unpackaging file:///C:/Users/George/Desktop/XX/_XC/XCG/BGDB.air to C:\Users\George\AppData\Local\Temp\fla462D.tmp
[2011-07-12:12:15:51] Package signature validation failed
[2011-07-12:12:15:51] Got an unexpected fatal error while unpackaging: [ErrorEvent type="error" bubbles=false cancelable=false eventPhase=2 text="invalid package signature" errorID=5022]
[2011-07-12:12:15:57] Application Installer end with exit code 7
I have another application developed in Flex Builder 3 and a release build with the same installer has no problem.
I appreciate you reading this and trying to help me
Try to download that again or disable the antivirus while downloading and after that enable it. Further try to run it in administrator mode if possible.