Unable to update to CoursePress 2.0

I am trying to upgrade from CoursePress 1 to CoursePress 2.1.1 and on the screen where it converts the courses over, it gives me an error of Update unsuccessful. Please try again! This goes on continuously. Already tried the suggestion below and didn't work:

https://premium.wpmudev.org/forums/topic/updating-course-press-pro-2#post-1268341