Creative Suite 5 Design Premium for Mac OS Electronic Download Installer will not open, revoked security certificate

I have downloaded, three separate times now, the installation media for Creative Suite 5 Design Premium. The .dmg downloads fine, I open it and can see the file contents, however when I double click install to launch it I get the error that it cannot open the app, upon clicking the "?" it tells me that though the app is from a trusted developer it's security certificate has been revoked. I get the same error when I try to launch from the Unix file under >"show package contents" > "mac OS" >"Install". Customer support has been completely unable to assist me, however I have had fun explaining this problem repeatedly whilst being asked unrelated questions and receiving no help. I have so far not even been able to advise any relevant party at adobe of the issue with their download file. If anyone can help me get this issue pushed through to someone in IT who can fix the security certificate in the file, or if anyone knows a way I can get the installer to open, I'd love to be able to use my program.