Thanks for the quick reply.
I realized shortly after posting my last message that I failed to put the modified files in /EFI/CLOVER/ACPI/patched. I wasn’t sure which ones to put there, so I just copied & pasted them all. I can now boot into El Capitan but nothing has really changed. For example, I go to System Preferences > Displays, and under “Scaled,” the only option is still just 1024x768.
Also, when I installed Windows 7 six months ago, my touchpad double-clicked on everything that I single-clicked until I installed the proper driver. The same thing’s happening in El Capitan. (Drop down menus immediately drop back up. Really frustrating.)