Some download sites offer a trial version (limited gameplay) for free to test if the game runs on your system before purchasing.
You may still find physical "Big Box" Collector’s Editions on sites like Amazon or eBay , which sometimes include a manual, sleeve, and poster. What’s Included in the Collector’s Edition ? Wings of Prey Free Download (Collector’s Edition)
Features nearly 50 historically accurate aircraft , including the Spitfire, Mustang, Messerschmitt, and the Collector's Edition exclusive P-40E . Some download sites offer a trial version (limited