When installing mine… I say that as I recently upgraded everything from scratch…but likely more like a month ago…I had a couple of errors that were holding me up… @wpferguson pointed me in the right direction… I will try to find that old post and his advice…it was around setting environment variables I believe…
EDIT: It was this for me…once I had it corrected there were no errors and things proceed fine… it may not be the fix for you but you could check…