I have LR 3 on my old laptop (which is running 0S 10.9.5.) Can I access that LR program from my iMac El Capitan 10.11.03?
Maybe, but probably not
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)
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
-and more on gatekeeper https://support.apple.com/en-au/HT202491
Thanks a million for replying so quickly. I thought as much anyway. Sigh.
It is amazing what you can accomplish if you do not care who gets the credit.