So many people having the same problem: TL;DR.
At first, I wanted to not help them and let them suffer because their laziness is a choice of them.-, but, well, some people are honestly lost at it, so here is the solution for everyone, for once and all. Share the word without limit.
1. **** Orca. You don't need it.
2. BootCamp 6 download link:
http://swcdn.apple.com/content/down...3x20i5ge93l2yu869yegn222i8l/AppleBcUpdate.exe
(There may be more recent versions and if you have the link, please share it here. But that version works on unsupported hardware, which is fine enough.)
3. You don't want to install all drivers, but just the ones you need. To do this,
after uncompressing AppleBcUpdate.exe, just delete the folders containing the drivers' installers.
(On a personal note,
I just put the BootCamp.msi file on my desktop. Faster and easier, and I had everything I needed working.)
4. Once you are ready,
open a Command line window as an administrator (
it won't work otherwise) and navigate to the BootCamp.msi file and type the following command:
msiexec /i Bootcamp.msi
(This command also works with BootCamp 5 and any software.)
5. Don't mind the error message(s), it won't stop the installation and is normal since you deleted the unneeded drivers.
You're done. Wasn't was hard, was it?
All of this worked fine for me using a MacBook Pro 2010 with El Capitan (since, upgraded to Sierra) and installing Windows 7 via BootCamp and then upgrading to Windows 10 from Windows 7 and upgrading BootCamp to version 6 using the provided link. Everything running without issue.