Hi there.
I didn't bother. There is a post somewhere^^^ that indicated it wasn't needed. So I took a flyer and just downloaded the DisplayCal thingy.
It did keep asking me if I wanted to download other bits and I just said yes to all.
On one of the options on the top line was the ability to download the Argyll stuff so I said yes to that as well. No idea if it was needed, or if it downloaded correctly.
Now I'm no techy and my eyes glaze over when faced with techspeek so I may not have done it in the approved manner. But it is there, and when I plugged in my Spyder3 Pro it set off on a 90 minute trawl through all sorts of things.
I'm assuming it is working correctly. I may be wrong. Give it a whirl. You can always uninstall it!!!