Do I need to create 2 installs for the webupdate to work?

I created an install
I enabled webupdate
I created a manifest file (filename.wup)
I uploaded the manifest to my website

when I try to run webupdate.exe I get an error message
The Webupdate client could not locate an associated application to update

i must be missing some steps
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Eric Jacobowitz
www.castlecomputer.com
www.cctsoftware.com