A SOLUTION THAT WORKED FOR ME!
Both Final Blitzkrieg and Normandy kept crashing after 20 to 40 min play. By coincidence i discovered that my powersettings in Win 10 was set to balanced, even though i remember that ive put it to high performance. Go to win 10 menu, power options and additional powersettings. Click HIGH PERFORMANCE, save and start game as administrator, No crash for 4 hours now!!