A new version of MultipleProperty has now been released .
New Minor Features
Edit captions will now be used in error messages rather than property names. In previous versions if there was a property named “ImageGalleries” collection with an ImageGallery entity having a property named “Gallery name”. The error message would have referred to the property name as “ImageGalleries_GalleryName” where as now edit captions will be used so they will appear like this “Image galleries – Gallery name”.
A new setting has been added to the multiple property configuration to allow asterix’s that appear next to the label text for required fields to be hidden. This setting is named “showAsterixForRequiredFields” and it’s default value is true.
The easiest way to install the assembly is by installing it from the EPiServer nuget feed (once it has been made available). But if you are not down with the cool kids you can download it from codeplex. The assembly is built for EPiServer CMS 6 and onwards.