So I tried with all the potential version of Dynamo. Nothing works. But I then noticed something !!!
My Revit 2019 is running Dyno 1.0.1 instead of 0.9.
In my \AppData\Roaming\Dyno, I dont have any subfolder presenting the two installed versions. It looks like it is potentially not possible to have two versions of Dyno installed or sthing like that.
The questions has already been asked here Dyno Browser for all versions of Revit, but still no asnwer…
Only @Aleksey_Lobanov would know the answer for sure 