Gibbed is an awesome guy and an amazing coder.
Remember check the version of the game to the trainer disable or tell your A/V to ignore the trainers. Run Steam and the trainer in admin mode. Also do a check to see if you have IE10. Also you can use the tool on page one if none of that works. Which should work. But the issue was repaired by steam. So the trainers should work fine.
Well I do not know where you are getting your info about the admin issue. As I have always ran it as admin with no issues at all and none non steam games has went bye bye either. That has been four years and counting.
Ditto here... no issues whatsoever running Steam as admin in as long as I can remember.