i need solid edge for school. Solid edge St4 worked well until i upgrade to win 10. But now when I want to open a now isopart project a warning come and solidege close. I can't open any par. or assembly files, but draft files can be open and i can make a new drawing project but when i do anything in 3d solid edge crashes. Thank you for your answers!
As you found out ST4 will not work on Windows 10 which is understandable as ST4 was released about 4 years before Windows 10 existed. I suggest you upgrade to Solid Edge ST8 as it is the only version to support Windows 10.