All previous updates (1 and 3) are required for this release to work. There is no changelog available for this update but it was suposed to fix the teleporting aliens bug.

Publisher: 2K Games
Developer: Firaxis
Genre: Strategy

Release name: XCOM.Enemy.Unknown.Update.4-BAT
Size: 187 MB
Links: Gamespot – iGN – NFO – Torrent Search

Download: NETLOAD – UPLOADED – RAPiDGATOR – RYUSHARE