Just got it from the store
http://store.steampowered.com/app/379720/DOOM/
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Free Weekend - DOOM
DOOM - Valve
Play DOOM for FREE starting now through Sunday at 1PM Pacific Time. You can also pickup DOOM at 50% off the regular price!*
If you already have Steam installed, click here to install or play DOOM. If you don't have Steam, you can download it here.
*Offer ends Thursday August 27th at 10AM Pacific Time
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