The special deal for Alien from Apple and 20th Century Fox comes in anticipation of Alien: Covenant set to release on May 19th, but also along with today’s live streaming of the Alien Day event from Fox Studios.
By the way, just because you use Windows doesn’t mean you can’t buy a movie from Apple. iTunes is supported on Windows PCs just as well as on Apple OSX and iOS devices.
Alien from iTunes can be streamed in 720p or downloaded in 1080p. The 1080p (Full HD) file is a 4.62GB download, while the 480p (Standard Definition) is 1.95GB. The movie typically sells for $14.99 in HD.