All links on that page pointing to any files on airdownload.adobe.com appear to be failing. This includes ALL linux versions and most windows and mac versions.
I don't know how long it's been inaccessible. Chat support appear to neither know nor care how this might be remedied and are not prepared to contact anyone regarding it.
Ultimately, i'd like to access the latest supported Linux version of Adobe AIR (which you mention above is v2.6).
Can anyone help?
Thanks