Error message in JBDS when installing into existing folder needs work

Got an error message trying to install JBDS into an existing JBDS folder:

You can't upgrade by installing over the top (sic)

We should consider fixing this message in JBDS 9. Perhaps something like this?

Specified folder already contains a JBoss Developer Studio installation. One does not simply install into an existing install folder. Choose another folder or cancel this installer and run JBoss Developer Studio to perform an update.