On Fri, 10 Aug 2018 at 07:55, Gavin Lambert via Boost-users <boost-users@lists.boost.org> wrote:
Am I missing some incantation?

I doubt it (reading through your whole post), I've had equally bad experiences with side-by-side installs of VS15 and VS17 and eventually reverted to reinstalling VS17 from scratch as just uninstalling VS15 made the mess even bigger.

"If something cannot go on forever, it will stop" - Herbert Stein