I need to know how .air installation/update works under the hood

Hi, we always get support tickets with people that can't install or upgrade the applications we build with AIR, the error they get is that the "installer is corrupted". This happens on Windows.

We tried all the workarounds we found but it did not work, I also tested with native installers and installation of native installer worked fine.

What I want is to know exactly how installation of .air files works,  what programs perform this, how to configure them, how to read the logs, we need to figure out what is the problem and fix it.

P.S.  it would be great if AIR developers could find a way to put a better error message.