Installing W10M TP

[Bagzton]

Please can someone help me with this. I'm trying to install 10586.107 (slow ring) on my 920 using my cellular data (I have about 4Gig data to spare) but I keep getting this message "Your connection is roaming. We'll try again later automatically." And then there's a retry button which does nothing when I tap on it. Can anyone explain what that means? And is there a way to get rid of it so I can continue with the download?