Installing problems CS6

CS6 and earlier programs have not been tested and will not be updated to run on Mac El Capitan

-which means that you try to use CS6 and earlier at YOUR risk of having problems

-you may get CS6 and earlier programs to install and run, or you may not (some do, some don't)

That MAY be a false error message due to Mac El Capitan and OLD programs

This information is a MUST DO to install old programs on Mac El Capitan

-you may not get the same error message, but these are some links that MAY help with old programs

-Java https://helpx.adobe.com/dreamweaver/kb/dreamweaver-java-se-6-runtime.html may help

Install CS5 on Mac 10.11 https://forums.adobe.com/thread/2003455 may help (also for other than CS5)

-also a TEMPORARY security change https://forums.adobe.com/thread/2039319

-http://mac-how-to.wonderhowto.com/how-to/open-third-party-apps-from-unidentified-developers-mac-os-x-0158095/

-and more on gatekeeper https://support.apple.com/en-au/HT202491

Hi Nick, try creating a new user account on your Mac with full admin privileges, then install from there. Let us know if that helps.