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Steam's giving us all more control over update downloads, mainly because the big publishers just can't stop themselves releasing 100GB+ whoppers
Steam has begun testing new settings for game updates in the Steam Client Beta, which anyone can opt into, meaning they'll soon be added to Steam for everyone. The improvements essentially give you more granular control over when and what Steam downloads in terms of updates, and it seems to be a response to the ballooning filesizes of contemporary big-budget games.