Unable to locate .MSI package

Question

Hi Experts,

i've used the AutoUpdatorDotNet dll to auto-update my application.

I've done all things according to documentation from codeplex site.

App Check for the Updates perfectly.
Download the Update Perfectly

But... When try to install the New Update it shows an error 

"An error occured Attempting to install Setup" and in Details pane... it shows "Unable to locate application file 'Setup.msi"

 Nothing found in documentation of AutoUpdaterDotNet Regarding this error.

 Please help me out.

 Thanks Alot