Welcome to the forum.
Please provide a better description of the issue that you're having.
When i open revit i have
projects Familes
Open Open
New New
Construction New Conceptural Mass when i click to open nothing happens only when opennig conceptural mass 2015,2017
Structural
Mech.
Maybe you don't have the mass template? Do you have this folder?
C:\ProgramData\Autodesk\RVT 2015\Family Templates\English_I\Conceptual Mass
There is supposed to be a file called Mass.rft in that folder
I would upload that file, but the forum doesn't allow the upload of .rft files. (?)
@Anonymous wrote:
it is not Conceptual Mass Templates But New Conceptual Mass
"Conceptual Mass" is the name of the folder that contains "Mass.rft", which is the template.
"New Conceptual Mass" means that you click and "New Conceptual Mass" and Revit opens a new file with the mass template.