c# - Update Application via WCF -

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i've application reads online database current version of application itself, when make changes application use create new msi setup , put on server, change version inside database , when application starts notices there newer version , asks user update. during update downloads msi file , launchs after download: problem.. when user tries install new version popup message appears saying version of software installed in , can't overwrite it! ideas?

have looked using clickonce deployment?

http://msdn.microsoft.com/en-us/library/t71a733d.aspx


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