I have this message: There is a new version of CoursePress

Hi,

I have this message:

There is a new version of CoursePress Pro available on WPMU DEV. View version 1.2.6.5 details or download update.

Do I need to download the plugin again and re-install to get the update?
Will this affect the work I've already done with it?
Why can't I automatically update from the plug in page?

Thanks
Phil