When I follow along with the First Steps video, and load up the file “First Steps Blues Song - Ma Rainey See See Rider - start point project.dorico” and apply the factory playback template HSSE + HSO (Pro)
- which is the correct one for me
Not all the instruments are found and filled in 
As you can see from this screenshot:
When I change the template to HSSE (SE) - for the free version of Dorico - then all instruments ARE found and filled in. Isn’t that weird ?
Is that intended ? Or a bug ? or did I do something wrong again ?
Thanks,
Paul
It suggests that you haven’t successfully installed all of the sound content that comes with Dorico 4. I suggest you run Steinberg Download Assistant, locate Dorico Pro 4 on the left-hand side (e.g. under My Product Downloads), then on the right hand side find Sound Content for Dorico Pro 4 (recommended) and install (or reinstall) it.
I reinstalled the Dorico 4 content,
First I had de Download manager delete the folder. The button showed ‘Install’ now.
Then I installed the content. Downloaded the 10.02 Gb set all fresh…
After this I checked in Dorico, and the instruments are still missing when using the factory HSSE + HSO (Pro) template, but now the instruments are in a slightly different order, with most still missing.
It seems Dorico has some kind of quarrel with me 
EDIT:
Maybe because the HALion Sonic SE folder is almost empty ? But then the HSSE playback template shouldn’t work either…
Can you take a screenshot of Steinberg Library Manager and attach that here?
which is rare in the modern world 
