tried three times to install it last night via Win update, and all three froze my PC, requiring a hard restart. Tried again before bed, leaving it on all night: frozen at 16% this morning. <sigh> maybe if I ignore it, it will go away. Disabled Emsisoft this morning so we'll see what happens as it tries again.
EDIT: Finally got it installed (with EAM disabled, although that may be unrelated). When I originally started to download the installer and didn't realize Windows update was also downloading it, the world stopped turning there for a bit.