So that I can keep better track of my downloads and bandwidth (over 9GB of a 14MB file served so far!), the location of the download for these alphas has [not] changed.
DISREGARD. The original link still works,
I apologize for any confusion.
To avoid this in the future, I may simply direct users to a web page that will list the available ZBrush resources I have to offer (I have some new ones already made and will be available soon, plus new ones planned). Since that web page doesn't exist at the moment, I'm providing the new direct link above.