You can't save PDF documents with versions of Adobe® Acrobat® Reader® older than 4.0. You therefore need a recent version (you will find the link to download it on our technical help page).
You also need to add Acrobat Reader to your web browser parameters. In the Acrobat Reader menu, select file - Preferences - General. In the pop-up window, pick "Add to web browser." When this option is enabled, the PDF file will open in the browser with the Acrobat Reader tool bar, which displays a floppy-disk icon for launching the "save" procedure. If the option is not enabled, open a download window by clicking on a link to a PDF file in the browser. You can then save the file or open it in a new window.
Note: our tests on Netscape show that, as the option is already enabled by default, it needs to be disabled then re-enabled for everything to work properly.