should I buy a thunderbolt to Ethernet adapter? I want to download OS X Mavericks and clean install it on my rMBP. I remember an iOS app needed to be downloaded via Ethernet to work correctly and users that used WiFi had problems with the app, I don't know whether that was a bug of iOS or because of WiFi that caused this issue. My internet connection is very slow and it takes 6 hours to download OS X. So can WiFi corrupt downloaded files?