I took a peak, and to my knowledge, it is a 39 dollar purchase and not 'free'.
Just in case, you havent already...
May I suggest the "Panzer Battles Demo", which uses the new graphics, and has +13 scenarios! It´s almost like a full game.
Also, you may like "Modern Air Power SPV", which is a single player version of the MAP series. I counted atleast 10 scenarios including tutorials. It´s also free.
Remember, to exit the game hit the "x" key! Or you will be looking for the manual on how to get out of there!
I have "Modern Air Power War Over the Mideast". It´s quite fun, here´s a vid of mine...
With all the demos he´s got, you have plenty of game time for free, which is nice of him!
Win10 Pro(x64), i7 8700k @ 4.7Ghz, 32GB ram DDR4, EVGA GTX 1070ti 8GB, M.2 PCIe NVMe (x2) 480GB + 960GB SSD´s, LG 29' Ultrawide 21:9 monitor Logitech G13, G502, TM Warthog HOTAS, CH Pro pedals, TrackIR 5.0, Corsair Void Pro 7.1 USB.