Anyone tried to install a Windows 7 dual boot on a 2015 MacBook Pro?

Do not use Bootcamp Assistant. The Macs after Late 2013 models support UEFI and hence can be used to install Windows using a Windows installer without using BCA. BCA is a partitioning/MBR manager. It also helps download BC Drivers.

Insert Windows installer media (USB or DVD) and use Windows Installer to directly boot from and choose EFI boot (not Windows legacy BIOS mode). You may run into issues with W7 drivers. W7 EFI support is lacking, but W8 (and W8.1) support EFI much better. You can create a FAT partition using Disk Utility and test with the W7 EFI boot.

The other option is to use W7 BC installation from an older Mac and use cloning software to move such an installation to the newer 2015 Mac.

Have you tried both, a USB and an external Optical drive on a 2015 Mac using the Alt Key?

I'm in a very similar situation (trying to get W7 installed on 2015 13" MBA) and have tried to install Windows via USB and optical drive. I am unable to boot from either (but I can boot to an OSX installer-USB just fine). The computer will just sit at a black screen after selecting the optical drive / Windows USB installer, the proceeds to boot to OSX. I feel like I've tried everything with no success.

I'd be very interested to see if anybody can come up with a workaround.

Note: Also have tried rEFIt with the same results.

You may have to install W7 on an older Mac and use products like Winclone or CampTune to clone it to the 2015 MBPs.

I'm not familiar with either of those programs. Can anybody testify to how well they work (particularly with cloning / imaging Boot Camp partitions)?

I have used Winclone 4.4 to move BC partitions. Please see https://twocanoes.zendesk.com/hc/en-us/articles/203444057-Boot-Camp-Migration-Ov erview .

Any luck with this? I recently bought a Macbook Pro "15 (mid-2015) model and would rather have Windows 7, since I've already bought an Ultimate license of that.

Trying to install an 6+ year old OS on current hardware is fraught with issues and driver challenges.

1. Use a Virtualization engine (VMware Fusion, Parallels, VirtualBox) but this has it's limits in terms of gaming etc. Day-to-day Microsoft Office and some light use is relatively reliable.

2. Use cloning from older Macs to 2015 Macs. Requires access to more than one Mac (at least temporarily).

3. Use native EFI Boot installation since the 2015 Macs are UEFI-compliant. This has driver challenges written all over it.

4. Find a used 2013/2014 Mac which allows W7 installation.

1. Virtualization is out of the question in my case as I need direct hardware access for certain applications, I would have done that already if it would have sufficed.
2. I don't have a spare (older) Mac.
3. I will have to try this. Win 8 isn't too different from Win 7, so drivers could be compatible. But as others posted earlier it seems they didn't even get the option to boot, so I was just curious if they had any update on their status!
4. I've already bought the latest Macbook Pro, I'm not going to buy a second one just for Windows.

Are you using a x64 copy of Windows? I would recommend Win7 Ultimate x64.

"3. Insert Windows 7 SP1 X64 DVD. Note: One of the common issues we see is that users try to install X86 version with UEFI enabled in the bios. X86 does not support UEFI so you would have to configure the machine for Legacy boot to install X86 versions of Windows. If you do try to install X86 version setup will run but on the 1^st reboot you will get BIOS error similar to “No bootable devices –Strike F1 to retry boot, F2 for setup utility. Press F5 to run onboard diagnostics” "

-- http://blogs.technet.com/b/askcore/archive/2011/05/31/installing-windows-7-on-ue fi-based-computer.aspx