You can download the trial version of the software thru the page linked below and then use your current serial number to activate it.
Be sure to follow the steps outlined in the Note: Very Important Instructions section on the download pages at this site or else the download will not work properly.
When I click on the download link for Flash Professional CS6, I get directed to a page that says this:
You don't have permission to access "http://trials2.adobe.com/AdobeProducts/FLPR/12/osx10/FlashPro_12_LS16.dmg?" on this server.
It happens if I click on the download links for the other programs, as well. Is this due to the download links not being valid anymore? Or is it something to do with my computer?
You can opt to download Dreamweaver CS6 only if you had purchased a subscription of it previously. Flash CS6 is not available as a trial version from what I know. However, you can use this information in the post to to download it from a third party site.