Hi Max,
The link http://trials2.adobe.com/AdobeProducts/DSST/CS6/osx10/DesignWebPremium_CS6_LS16.dmg works fine.
Adobe sets a session cookie on your browser that allows you to access the direct download links. Otherwise, you will receive an “access denied”. You need to be signed in to Adobe.com.
Please try from a different browser and check.
Regards,
Rave