Latest version of Steinberg Download Assistant will not run

I have the latest version of Mac OS on my MacBook, and have downloaded the latest version of Steinberg Download Assistant and installed it. It will not respond or run. I have tried uninstalling the download assistant and re-installed it several times and nothing happens. One time it churned for about 15 minutes then said it was not responding. I would really like to update my Dorico to the latest version.
Anyone have any ideas what to try next?

Direct download: Dorico 6 Downloads | Steinberg