To those of you who are considering upgrading your old machines to macOS Sierra, but who haven't done so yet, following is a list of some of the key features which Sierra brings to the table:
• Siri integration
• Auto unlocking w/Apple Watch
• Apple Pay for web
• Revamped Apple Music app
• New storage optimization
• New file system w/native encryption (not yet)
• "Memories" tab in Photos
• Cross-device copy and paste
• Tabs in a few more apps
I ask all of you to carefully look at the previous list and determine not just the things that you think may be cool to have, but rather the things that you really NEED to have on your older machine to improve your workflow and increase your productivity.
If the ones you can do without are more than the ones that you really need, then perhaps you should forego installing Sierra on your aged machine, and just be content with El Capitan, as I now am.
For me personally, there is not a single thing on that list that I really need or want.
How about you?
But if your desire is still to have the latest and the "greatest", well then, go for it . . . but I hope that the contents of this thread serve as a warning to you that you may possibly be in for a bumpy ride.
Or maybe not. Maybe the installation will go as smooth as butter for you, just as it did for me. But then later, bad things began to happen and revealed themselves, such as a broken iSight camera.
Folks like dosdude1 and foxlet are doing their very best to help you install Sierra on your old machine -- and investing a lot of time and energy into their endeavors -- but you need to realize that there are so many different machines, and so many different personal configurations and setups out there, that success for one does not guarantee success for all; even if you are running the very same machine as someone else. You may have different apps installed, or different peripherals attached, or a different kind of hard drive, or a different amount of memory, etc.
My point is, installing macOS Sierra on our older machines is like the Wild, Wild West. Anything can happen, and probably will, eventually, somewhere.