I created a working path on my desktop using ansys mechanical APDL launcher. Later, when I wanted to create a new working path, I found that the program reported an error, saying that new files could not be created in the license list. Here is a solution for you
ansys14.0
Find ANSYS, Inc. License Manager (I found it directly in the Start menu, My file path is C:\ProgramData\Microsoft\Windows\Start Menu\Programs\ANSYS, Inc. License Manager).
And run the License Manager as an administrator.
Open dialog box as shown in figure.
Click stop the ansys.inc.license manager, that is, close the certificate management, the right side of the display is successfully stopped.
Click start the ansys.inc.license manager again, that is, re-open the manager, the right side shows that it has been re-opened, and you can exit at this time.
At this point, open the mechanical apdl product launcher, and it will be successful after a while