Problem for debugging with Flex 4.6

As many people on internet, I had problem for debugging with the new Flex.
From all my research, that's begin with flex 4.5.
After tried many time,I always have  "the version of flex debugguer is not correct".
I tried with IE, Chrome, Firefox,  I installed many time, nothing to do, that's don't work at all.
Each time I tried install debug version of flex, adobe instalelr say "you have the last one" grrrrr.


So, how to do ?
My solution is a bit strange but work very very well for me :
Uninstall flash, and install again !

For do it, for windows in my case :

http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

After, just follow the normùal step for install and that's work !