Neilo, thanks for pointing this out, we have added a note in the download center to alert people that Universal Email, Digital File Pro, HTMLEditor and validation toolkit will need to be uninstalled before installing CSS Form Builder 2.
Ian and jm271908,
Can you please provide some specifics on the problems that you are encountering so that we can look into them to identify the case.
Screen shots of the errors messages or links to pages demonstrating any issues will be helpful.