Does Boot Camp Support Software 5.1.5621 works for windows 10?

some drivers do some features don't like the bootcamp tool down by the clock and likely a lot of the features one adjust in there like key function and touchpad stuff

I use it on my old imac 21" mid 2011 because it does not officially support win10 so the bootcamp assistance can't get the later bootcamp image

You cannot use BC5.x drivers for W10. You need BC6.x drivers. They can be downloaded using