If you buy it you must download it from the internet. If you want to play single player, im pretty sure you dont need a connection. But if you want to play multiplayer,which requires an internet connection.
You need an internet connection to download and run it at least once. You also need an internet connection to get updates, patches, and multiplayer.
Private Mod Note
Rollback Post to RevisionRollBack
Did your world disappear from minecraft? Is it corrupt? Lags? Can't move? "Saving Chunks" Crash? Crashes when you open chests? It can be saved!
Minecraft Saver World Recovery Website: http://mcsaver.net. Recover and save your precious worlds! Over 1500 saved!