Trouble with trial download - error messages for sounds at opening

Trying to decide if Dorico is for me - have been using Sibelius 6.2 since before Adam.

Having downloaded all four elements as per the download manager, I find there is no sound. No sound on extant example tracks, no sound on the few files I’ve converted to Midi and imported.

All “play”, but none sound - and worse - I tried to work on Sibelius tonight, the same problem is now happening on it too.

Where do I start, please?

Welcome to the forum! Have you applied a playback template to the project? There should be one called HSSE+HSO (Pro).

You can also check the audio output device selected and its settings in Preferences (press Ctrl/Cmd-,) > Play > Audio Device Setup.