Initial Update cannot be configured via Policy.  However, you could configure Automatic Update to run and set the Reboot Action to "Reboot Immediately".  This would perform quite similarly to Initial Update since the patches will install and reboot as necessary without requiring user interaction.  Install order will be different, but the end result is about the same.

I've come to the conclusion that Kaseya Patching is really suited for scheduled operations. It's not great for on-demand.

I've spent some time developing a few Agent Procedures that uses a Powershell module to run Windows Updates on demand. That works really well for me.

Hi Lothario, can your share us your Agent Procedures?

Thanks Richard

Sure, give me a day or two...