Product version change
The Version property should be changed for each released version of your installer or merge module. When the Version property is changed, you should also update the ProductCode property to prevent possible version conflicts.
The Product Code and Package Code are different properties. Visual Studio does not support setting the Package Code. However, you can access and modify it using the summary information screen in Orca.exe, a table editor for creating and editing Windows Installer packages and merge modules. See "Orca.exe" at http://msdn.microsoft.com/library/default . asp?url=/library/en-us/msi/setup/orca_exe.asp.
To correct this error
Choose Yes. The ProductCode will be automatically updated.
To change the Version without updating the ProductCode:
Choose No. The Version will be changed; the ProductCode will remain unchanged.
To retain the old Version:
Choose Cancel. The Version property will revert to its original value; the ProductCode will remain unchanged.