Updating boot camp mac
(Though you should still check Apple Software Update prior to doing so, just in case there are any big updates you haven't installed for any reason.) If you're performing a Windows 10 upgrade to an existing 64-bit Windows installation (that you access via Boot Camp), you'll have to jump through a few extra hoops.Before you upgrade, you'll first want to make sure that the Mac you're using actually supports Windows 10 x64 to begin with.Additionally, some people have wondered whether or not the updates that state specific support for Windows 7 are applicable to Vista and XP installations.
If you're running a different version of OS X or have an older Mac, you'll need a 16 GB flash drive that doesn't have anything you don't want erased on it (Boot Camp Assistant automatically reformats the flash drive).
Install all the updates on that side, and then you should be free to use the normal Windows installation tool to update your version of Windows to Windows 10.