Thanks. The first 4 options are pre-selected; I unchecked the boxes and could then press “OK”.
The password met all the requirements of the checked boxes.
My previous test was to check the last box … not eliminate all of the selections.
Completely bizarre that I’m the only one to have discovered this installation issue.
The only remaining question is whether I will trust my data to a program that can’t install properly;
what other bugs lurk behind the green door.