I upgraded to ESS 8.0.319 before upgrading my Windows 8.1 to Windows 10 (via the normal, free download through Windows Update). After Windows 10 install, I received alerts that the firewall was not enabled (actually, not much was enabled, due to Defender and Windows Firewall being automatically enabled). So ESS did not properly transer, install, disable Defender and Firewall. I then ran the ESS 8.0.319 installer again, repairing or re-installing, and now things seem to be fine. Still thinking about uninstalling ESS for now, since I'm not sure of the compatability (some HomeGroup, network issues, probably more hidden).