Problem Download 6.4.14 By Wifi

Apr 22, 2016
Hy guys,
I'm new of this forum and I need yours help for my Mi4c!
I try from a week to download 6.4.14 but wifi don't want work with "Uploader"
It start and after few second it slow I'm not able to update my phone.
Wifi work very each other operation........., but if I try by data it is download speed...
I have had the same problem whit 6.3.24.
Can you help me?

The file that I try to download is