Download size

How many GB is The Butterfly Sign: Human Error?

20 GB

That is more than the typical Adventure game, which needs about 5 GB.

Leave at least 29 GB free: games need headroom to unpack updates.

The figure is the storage Steam lists as required for this game, not a measured download.

The Butterfly Sign: Human Error is the second chapter of the first person detective video game in which we are playing as a sole survivor of a serious terrorist attack. The protagonist is the only witness of the incident and his fate depends on his memories.