Hi,
It seems that you are not signed in using your Adobe ID.
You would need to first ensure that you visit the download page for the current version of Captivate i.e. Captivate 7 (
https://www.adobe.com/cfusion/tdrc/index.cfm?product=captivate) and sign in using your Adobe ID.
Once done, then click on the hyperlinks for "File 1" and "File 2" on the below URL as per your OS.
http://prodesigntools.com/adobe-captivate-6-direct-download-links-free -trial.html
Please let me know in case you still face issues while downloading Captivate 6.
Regards,
Sharad