how to install windows 7 on macbook air 2015

You could just as easily use an external hard drive (instead of a solid-state drive) if you prefer a lower cost/GB. Instead of installing Windows on a separate partition within an internal storage disk, you can opt to buy an external Thunderbolt solid-state drive on which to place the Windows OS. This is not hard to do, if you don’t mind the Windows partition taking up space on your disk drive -or- if you are willing to deal with the performance degradation from using the virtual machines: Parallels or VMware. Perhaps you want or need to install Windows on your Retina Macbook Pro. Guide: create external Windows 7 boot drive for Macbook

It will work if you follow each step iteratively. The link above is formatted more nicely, but I have pasted the text below. It will work for any Mac, but especially with retina and air users who are having trouble getting other methods to work. BEFORE running the install, you need to enter CMD within the install utility to 'flag' the external hard drive as active and bootable. Then you can run the Windows install from an external USB. The key to getting the whole thing to work is to run part of bootcamp - the one which creates a Windows partition - but (and here's the key) to make that partition on your internal hard drive VERY small (<1GB).

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How to install windows 7 on macbook air 2015