Just move it to C:\Windows\Resources\Ease of Access Themes folder and use it.
Of course, You can use this theme file on both 32-bit and 64-bit versions of Windows 8.
Applying the Classic theme will change the Start screen background and tile color to classic view as well.
NEW: theme is compatible with Windows 10 Technical Preview as well!
I think once Windows 10 reaches its end of life and Microsoft makes Windows just "Windows", they'll slowly start to decline. I could be wrong of course, I probably am, but I think making Windows as a service might not work out that well. I suppose they have to try. I've thought about switching to a chromebook. Couldn't care less about Crapple. I have a good feeling about Android.
Finally win10 looks OKAY, but in some parts even better than some much older windows versions. In combination with classic shell and aero tweaker and of course the xp sound theme, it is useable, thank so much, i would donate if there where a button!?