Battlefront has some Early War Flames of War PDFs available for download from their website for their 3rd edition of the game.
From the announcement:
With the release of Version 3 of Flames Of War in March, the game has stepped up to the next level. Battlefront has created a downloadable PDF for the three early-war books: Blitzkrieg, Hellfire and Back, and Burning Empires to bring them into Version 3.
This PDF updates the various arsenals and special rules to make them fully compatible with the new version of the rules and corrects several minor errors in the original books.