Then install:
A: For Vimeo, Dailymotion, or Twitch, use their mobile web versions. For Netflix or Hulu—no chance; they require newer iOS for DRM. youtube for iphone 4 ios 7.1.2 download
Sideloading is more of a nostalgic experiment than a daily driver solution. Then install: A: For Vimeo, Dailymotion, or Twitch,