Adobe has an FTP site available where you can directly download installers and updates of their products, without going through the site, license agreements and download managers.

Adobe Acrobat Reader & Adobe Reader

For PDF reading, the direct links are:

• Version 5 or older: ftp://ftp.adobe.com/pub/adobe/acrobatreader/
• Version 6 and up: ftp://ftp.adobe.com/pub/adobe/reader/

Links to other products will follow. Keep an eye on this post on the site.