Resolve 15.1 - failure to launch

Gidday there,
Updated this most excellent application 15.1 over 15.0. It begins to load then halts a few seconds later. The loading screen briefly appears, then vanishes. Version 15.0 ran fine. I've blown a day on this already with no solution.
Anybody else having this problem?
UPDATE:
Tsk, I should have included this information:
15.1 fails on all AMD gfx drivers, including the very latest (18.9.1). Version 15.0 has no problem with any AMD gfx driver (I tried three).
I have image backups of my system drive and can cleanly reinstall back to an older state. In fact when I get bad installs I always restore to a previous image... ALWAYS.
The install /update procedure claimed it was successful each time. Yes, I re-downloaded the 15.1 update and tested the archive.
I'm running the latest Win10 with 16gb of system RAM.
Updated this most excellent application 15.1 over 15.0. It begins to load then halts a few seconds later. The loading screen briefly appears, then vanishes. Version 15.0 ran fine. I've blown a day on this already with no solution.
Anybody else having this problem?
UPDATE:
Tsk, I should have included this information:
15.1 fails on all AMD gfx drivers, including the very latest (18.9.1). Version 15.0 has no problem with any AMD gfx driver (I tried three).
I have image backups of my system drive and can cleanly reinstall back to an older state. In fact when I get bad installs I always restore to a previous image... ALWAYS.
The install /update procedure claimed it was successful each time. Yes, I re-downloaded the 15.1 update and tested the archive.
I'm running the latest Win10 with 16gb of system RAM.