Regularly offers free PC games on a weekly rotation. GFWL not letting me play older games - Microsoft Q&A
The original version is available as a free download from Blizzard Entertainment.
Stormrise is a post-apocalyptic real-time strategy (RTS) game developed by The Creative Assembly. It features a unique "Whip Select" control scheme designed to facilitate 3D battlefield navigation from a ground-level perspective rather than the traditional "god's eye" view.
If you are looking for high-quality RTS experiences that are currently free or more accessible:
A tribal, mutated society that adapted and evolved within the new environment. Technical Challenges