Updating boot camp 2 1
Now, i did the same thing: i updated from Windows 8 to Windows 10 and i didn't need to update any drivers whatsoever.I had my Windows 8 installed with Boot Camp Drivers (but i didn't had the whole partition thingy because I installed Windows on an external hard drive) and i was able to upgrade to Windows 10 without touching the drivers at all.But be aware I originally had windows 7 Pro 64bit and used the official in-place upgrade to 10 by Microsoft.Then I used Microsoft's media creator tool to create a WIndows 10 64bit installer ISO image which I burnt to DVD.Would you like to answer one of these unanswered questions instead?
Step 3: Click the Choose button next to the ISO image box, and select the ISO file downloaded in step 1.
If it's unsupported you might have problems with drivers so why not just run it in a virtual machine as a totally file based VM, not VM tricks to get it physically installed or instead of using Boot Camp.
I took much encouragement from the accepted answer below.
I guess they mean that they don't put any further additional efforts into keeping it compatible onwards whenever MS decides to change W10 system logic.
However since W10 is really a polished W8.1, with basically the same "under the hood" logic, any Apple Bootcamp supported Mac up to W8.1 Mac's (like my Imac 2011) is perhaps likely to support also W10, even if Apple doesen't want to state that. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).