Visual studio installer question

Hello

I have an app that I've been using P&DW to distribute. But to many people have been having difficulty installing it or have been unable to install.
I've decided to move to another installer. I ran the Visual studio installer and it came back with a task list of 10 files. Not a good sign since there are only 13 filles in the project! The files fall into one of two catagories.
merge file or dependency info not available or
one or more files in the .MSM file have different versions

Any on have any idea where I can find either merge moduals or dependency info?


thanks

David