I did this from within Windows 10, by right-clicking on the Windows Start menu, selecting Disk Management, and then identifying and shrinking the Windows 10 partition, thereby creating some empty space. The next step for me was to shrink the Windows 10 partition by about 64GB to make room for the Kali Linux 2.0 install.I've detailed all the steps to getting the MacBook Pro to dual-boot Windows 10 in a previous blog post I wrote on my company's blog:

That can be easily done using the BootCamp boot manager that Apple ships with MacOS X, and the benefit of this approach is that this will also install Apple's drivers for Windows 10 properly, so your MacBook will work better under Windows 10 as a result. For historic reasons I started the process by making the MacBook Pro dual-boot into Windows 10 and MacOS X.Obvious disclaimer: this process has the potential of being highly destructive to all the data on your hard disk, so make a backup first! Even better, do this on an old laptop that you are happy to wipe completely. This process may require some tweaks, if you are using a MacBook Pro model from a different year, or a MacBook Air. But it is the one that worked for me and I haven't read any other articles about this anywhere yet, so feel free to follow this process (or not), as you see fit. Also, there are probably other sequences of how you can make this installation work, so don't think this is the only possible approach. There are plenty of old articles around on the Internet that will talk about Hybrid MBRs and other complicated, outdated, and dangerous hacks. You will need several tools to make this work, including a sufficiently large USB flash-drive (I used 1 256GB stick, but it can probably be done with a 32GB stick, too), a USB WiFi adapter (or a wired Ethernet cable, because the Mac's built-in WiFi is not recognized by default in Kali Linux), a Windows 10 license, another Windows PC (where you download the Windows 10 ISO image that you put on your USB flash-drive), and a few hours of spare time.Īlso, you need to understand from the beginning that all three operating systems are capable of EFI-booting and can handle a GPT partition table. I've recently managed to successfully install Kali Linux 2.0, Windows 10, and MacOS X Yosemite to triple-boot on my 2013 MacBook Pro laptop, and it took quite a bit of research to figure out all the pieces to this puzzle, so I though I'd share it here with the community - maybe this is helpful for some:

How to put windows 10 on a macbook pro