All roads lead to Rome: Can't download ADE for Mac OS 10.6.8

ADE 4.0 requires Mac OS 10.7.  All Adobe help and forum answers send me to Adobe Digital Editions downloads.  Pressing the link to ADE 2.0 or 3.0 sends me to a blank page.  Is it possible to use ADE on my MacBook using its stable current OS 10.6.8 or not?  If so, where are the download links available?   Posted later: Discovered that Safari downloaded the .dmg without showing anything to that effect.  Found the .dmg in downloads folder and installed; appears to function properly.