Mathcad Prime 8 Unhandled exception problem

I have installed Mathcad Prime 8.0.0.0. So before buying it I wanted to try it. But when I try to assign value to some variable, for instance when I write x := 5 it instantly crashes, giving this error:

An unhandled exception occurred on the dispatcher thread.

and then it directs me to logs. Logs are too long to include here and I have no idea what's causing it. As you can see
I will not buy the product unless this issue is solved. I appreciate your help.