I purchased pmdg 737 -800/900and I received the password for the download but it seems it don't work I don't know what to do !I have only downloaded (notice htm 0,6 ko) .

At the very bottom of the post you got from PMDG there is a link which will bring you to a page where you can download the file. No need to enter the password manually somewhere...What exactly doesn't work...? The download stops before you get it all or can't you you get to the downloadpage...?