It's fantastic that with the later builds of version 3.6, we can reference
the WixNetFxExtension and then put <PackageGroupRef Id="NetFx40Web"/> in to
make .NET 4 a prereq. 

<Chain>
      <PackageGroupRef Id="NetFx40Web"/>
      <MsiPackage SourceFile="MyInstaller.msi" />
</Chain>

Looking at the source code for the extension, that package has the
DownloadUrl attribute but not the SourceFile attribute, so would that mean
the user needs to have an internet connection? Am I right in thinking that
having a SourceFile attribute acts as a backup if the DownloadUrl doesn't
work?

Also, is it better to reference the NetFx40Web package or the NetFx40Redist
package from the WixNetFxExtension?

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