When you generate an MSI you need to set at least Product Version Product Code Package Code Upgrade code is not mandatory but in reality it is also a must or you will not be able to create upgrade msi packages. One interesting thing about ProductVersion is that you can choose to set a 4 digit version like 1.1.1.0 but MSI will only use the first three digits for version checking. Its format is major.minor.build. This is important if you decide to create a update or upgrade package. Have a look for ......