Yesterday UR4 for Windows Azure Pack was released.
Download here: http://support2.microsoft.com/kb/2992027
All the downloads will be stored in separate folders, and in this folder you will find the CAB file needed.
You will need to extract every single CAB file to get the MSI file to update a WAP role.
For me this was a little to much manual labor, Powershell to the rescue!
I’ve made a script that collects all CAB files in the folders and then extract the MSI files.
After that, the script installs the MSI files.
Saved me at least 10 minutes, and 100 clicks 😉
Download from the gallery: HERE