Okay so Windows 10 Creators update has some seriously messed up memory management issues. So here's where it gets really weird, I just rolled it back, now 4.6.2 installs fine. No issues, no hangs. I really don't even know what the heck just happened there but "shrugs in confusion".
I did find somethings interesting, when it was successful, it asks you to close certain apps that make use of Net Framework:
Razer Synapse
Killer Ethernet (this is an MSI Gaming Motherboard specific to how its network adapter functions)
To that end if you're having issues clear out any running background or support apps before trying to install as I believe in some cases those are causing the installer to hang.