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I'm new to programming/development. I have an old Macbook Air. It's El Capitan OS X - 10.11.6.

I can't download the latest OS due to the age of my mac. I can't download the latest xcode due to the age of my OS.

Is there a guide to installing older versions of Rails/XCode/etc that are all compatible?

I've spent a few hours looking around but can't find any obvious solution. I've started trying to install some things through guides but there are quite a few error messages coming up.

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