Sorry to hear you’re having problems, John. Did you definitely run all three installers that were presented to you within the Steinberg Download Assistant? There is the Dorico 1.1.10 installer itself (you can ignore the 1.1.10 updater, if you see that), the HALion Sonic SE installer, and the HALion Symphonic Orchestra installer. All three of these have to be both downloaded and then installed for Dorico to play back sounds as expected.