SEP Install Fails On Windows 10 (1511)

Hello,

We have been deplooying Windows 10 for a few weeks now, and we haven't had any problems with SEP until today. Usually when the installer runs, it's quiet, but then we see the gold shield by the clock, eventually. Today, it's failing to install. Event logs don't say much, other than the installation failed.

I'm wondering if anyone else has run into this issue, and what you did as a solution?

We are deploying SEP 12.1.6 RU6 Build 6168.

Thank you in advance