Finally managed to install. Neither download nor install were straightforward. Didn't think s/w had downloaded until I saw dmg file in Finder. Opened dmg but didn't think it installed until I saw app in download area of Finder. Could not drag it to Apps area. Finally figured out I could copy/paste App to desktop and then drag it to Apps area. Now it's finally in right place and opens and runs properly. This will probably all get corrected eventually.