You can buy the game from the iTunes App Store via this link: https://itunes.apple.com/app/football-manager-handheld-2015/id870558917?mt=8
The minimum hardware required is an iPhone 3GS or iPod Touch (3rd Gen).
Your device must be running iOS 5.0 or later.
The game will require a minimum of 450MB to install but we recommend at least 700MB of free space to ensure correct performance.
Please post details in the bugs forum for us (use a new thread) and we'll do our best to talk you through resolving any problems you might be having with installing the game.
Such issues are rare, however they're also device specific so we may need to ask you a few questions in order to resolve them.