Then I did a test on another two Windows To Go creator software and managed to install Windows 10 to external SSD via UUByte WintoUSB Pro tool. Tried multiple times and still the same result. After selecting the USB drive, it comes to an error ' Failed to run system API (0x0005001501B200000)'.

However, it seems something wrong when running it on a Windows 7 machine. WintoUSB is great and a lot of folks recommend this app because it has a free version. This was the method that worked for me on an Early 2014 MacBook Air on High Sierra and should work on yours unless something in Bootcamp Assistant changed. Use the Windows Support Software to install the correct Apple Drivers in the external drive when inside the Windows 10 boot. You can boot from it by restarting and holding option and choosing the external drive. You should now have an external drive with Windows 10 on it, and the Windows Support Software on it as well. The connected external drive should show up on your mac again, and drag the Windows Support Software folder into the drive. Step 7: Once the WinToUSB tool finishes installing, you can close out of VMWare by shutting down from the virtual Windows. While this is running, go to the Bootcamp app and ONLY download the Windows Support Software. Step 6: Wait until the tool installs Windows 10 onto the external drive. Connect your external drive to your Mac, make sure it connects to VMWare, and select it once it shows up on WinToUSB. iso image onto it, and choose which version to install. Step 5: Open the WinToUSB tool and upload the same Windows 10.

Step 4: Go on your virtual Windows and download WinToUSB from this. You do not need to do this if you already have a computer with Windows 10 Step 3: Open the VMWare application and upload the Windows 10 iso image onto it, and run Windows. Step 2: Search 'windows 10 iso image' and click the first link from Microsoft. I used VMWare Fusion and used a 30-day trial. Step 1: Download a virtual machine to run Windows on. This is based on my own experience of installing Windows 10 on an external drive:

Wintousb for mac