Hi , I am working with Revit 2022 and it looks like it has Dynamo 2.10 installed with it .
For the OpenMEP package , i have installed it and i can even see its folders in dynamo package folders but it was not installed exactly in the 2.10 version , it was rather installed for further version (starting from 2.12 as shown in picture below)
But now i have fixed the issue by putting the folder inside the version 2.10 :
Thank you for ur great efforts!