As per instructions I installed El Capitan on a dedicated partition on the internal drive. Now when I click on Startup Disk in System Prefs, the drive partitions other than El Capitan are greyed out, so I cant restart on the old system. So of course I cant access Eudora etc. plus I cant figure out how to get started w Apple Mail. HELP!
Further: should I install the El Capitan update ASAP (question mark). . .
. . . and then install Affinity, and-or. . .
go back to the OS 10.6.8 partition (assuming I can get there!) and install CS2
BTW Is the correct way to maintain the same thread simply to give a new post the same name as I have here (question mark)
Have you tried booting while holding down the "option" key? If your OS's are on separate partitions, you should then boot up to a choice of hard drive Icons with each OS listed. Click on the older one you want and it should boot into it.