Thanks for your feedback.
A few years back, I had already downloaded demos of Cubase and Dorico but I did uninstall them. But you may be onto something here, as uninstalling tends to leave things in various folders (the two programs folder on the root directory and Appdata in the user root directory, in my experience). I did not check if everything was uninstalled, and with the new installation, I would not be sure of what to look for.
An option here would be for me to uninstall all Steinberg products, manually remove all remaining Steinberg folders (and registry keys ?? But I would need some cue here as to where to look and for what, although a registry search for “Steinberg” might do the job) and then reinstall afresh Dorico 5 and Halion Sonic 7 demos.
I do not really need to save my projects as, really, I just inputted very few notes and fiddled with articulations, expressions and the like to get a feel of the audio playback. Recreating this or something else to go on with simple tests would take very little time.
This being said, if you have a cue as to what to look for and remove instead of going through this drastic step, I would appreciate the gain of time (especially that this message is not so annoying in itself, but it does indicate that there is indeed some conflict somewhere, and it would be better to find its origin and correct it).
Best
PYL
PS: I currently use Overture as a notation program. It is quite fine for my needs and actually rather simple to use once one has some familiarity with its logic (and bugs). However, it looks like the development (and bug correction) is stalled, and possibly indefinitely stopped. Dorico is the closest analog in my view in terms of logic, although somewhat less intuitive to use (quite a few playback options, in particular articulations and expressions, are much easier to access and configure to one’s taste in Overture, but this may only betray my lack of familiarity with Dorico). However, Dorico is clearly a much more developed and prospective tool, which is why I consider to switch. I was a bit disappointed to find that there is no crossgrade offer for Dorico pro from Overture, but I guess that Overture’s user crowd is too small a target. Hence my choice of the Dorico Elements demo version for testing, as it is much more affordable.