Ok that was different. The big change to 17672 is about security. It made me restart again after it was installed to activate the Trusted Platform Module. It left the choice to reset it or not up to me. It said something about erasing some stuff that I didn't understand. I opted not to. Then when I went into the Security section of settings it was doing more stuff I didn't know about. Something about my antivirus needing to be registered. It looks like ESET is registering alright I guess. Anyway, it says it's all Ok. I guess more research is in order.
Did it make sense to you
@Sonny? I'm a little confused.
@nmsuk. The fixed issues page for this build says it fixes the "Stuck at preparing to install" issue while installing.