Here is a possible solution to the program crash issues that have been discussed in the forum. I made a new user account on my Windows 10 machine (from the Admin account). Then rebooted the machine. I logged in as the new user, opened my Hitfilm project and...continued working without a crash.
When you first login to the new Win 10 account may I suggest you go into the Settings and turn off all the blue slider buttons that may keep your machine constantly connecting to the web.
Check all the options under Settings>Privacy
You may also benefit by removing the live icons in the Start menu that may impact system efficiency or performance. Any experts on this here?