Partition Mojave HD to run Sierra

Started 5 months ago | Discussions thread
Tom_N Forum Pro • Posts: 19,353
Re: Partition Mojave HD to run Sierra
1

According to MacTracker, the 13-inch 2017 MacBook Air originally came with macOS 10.12.4. That means that it can't run anything earlier than Sierra 10.12.4, but it can definitely run the 10.12.4 version of Sierra (or run High Sierra, which is what I would recommend, applications allowing).

I don't know about partitioning the internal SSD, but you could install Sierra or High Sierra on an external HDD or SSD and dual-boot from that as needed. You can also install either on a USB flash drive, but if you do so, I'd STRONGLY recommend using a USB 3.0 flash drive, not a cheap, dog-slow USB 2.0 one.

https://www.maketecheasier.com/install-macos-on-usb-drive/

Here's a link to an Apple Support article that will help you to get the High Sierra kit, if you are interested.

Apple – How to get old versions of macOS

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