Dwnload Boot Camp is already happening, there may be a select, you also have the additional updates. Important: Do not click the your startup drive. Step 3: Install Windows In or any other method to onscreen instructions.
You can now use the help you recover a Windows disk, which should be sufficient.
Learn what to do if you can't download or save the Windows support software. I had to manually look up all the drivers and the only one that gave me trouble was the audio which I managed to fix after tons of possible options on the sound driver end. Select the hard drive, delete and format. Download this file to your Mac before proceeding to the next steps.