This can seem to be sort of a charitable offer by MS in at least partly extending support for Win 7... the Edge for 7 now auto-installing as a Defender update is supported until July 2021, and Edge has been in development for some 4 years. Defender has seemed consistently reliable, though a couple accessories not wanted have started to open or begin menus to open. In any case, it appears the auto-install will finish and start on its own. (It can also be much speeded up by running manually through Win Updates.)
Thanks for any insights or advice.