I get the error code 6. None of the suggestions have helped in the KB from the FAQ of the installer page.
I cleared my AMT log then ran Flash Builder once so it is a clean log. I have rebooted about 15 times today trying different things. I have used the plug-in for eclipse, which gives me the error but then works anyway. I was about to create a quick and dirty Air application to make sure it worked. It has relaunched several times. It gives me errors when I open Flex projects but it still works.
The Air apps that I create with the plug-in version work fine. Standalone still not working.