WIX: Sleep between Custom Actions during installation

If you require to pause your installation between some custom actions, you can use the following:

<Property Id="QtExecDeferred" Value='"ping" -n 15 127.0.0.1'/><CustomAction Id="QtExecDeferred" BinaryKey="WixCA" DllEntry="CAQuietExec" Execute="deferred" Return="check" Impersonate="no"/>

The QtExec allows to run command line silently.