Microsoft Flight Simulator 2004: A Century of Flight (FS2004) is officially discontinued and not available for a direct "free download" from Microsoft. However, because it is over 20 years old, it is often treated as "abandonware" and can be acquired through physical used copies or legacy digital archives. Methods to Acquire FS2004
: It is highly recommended to install the Flight Simulator 2004 Update v9.1 from community sites like Fly Away Simulation to fix stability bugs that occur on modern systems. Microsoft Flight Simulator 2004 Free Download
: The most reliable way to own the game is to purchase a used 4-disc set. You can find original sets (sometimes in a collectible tin) on marketplaces like eBay for around $20.00 or discounted sealed copies at Mercari for $11.70 . Microsoft Flight Simulator 2004: A Century of Flight