Welcome to the "Old Science Initiative", astronauts, war heroes, Olympians... Who else is worthy of the best honors?
Welcome, astronauths, Olimpi- Wait, wait, wait. It's a demo.
Setup:
Steam: Extract in "sourcemods" folder
Non-Steam (my method): Extract in game folder and rename in "portal2_dlc4".
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Old Science Initiative Early Beta (Old vision) has not been tagged yet.