Open up the CoventorWare-mcosmld.log file . Check if the file has message shown below:

Open up CoventorWare license file with a text editor, for example Notepad and check the Start Date. If the Start Date is in the future, please contact Coventor Technical Support at support@coventor.com. Do not try to edit the Start Date; this will invalidate the license file.

Please note that this is just an example. You may have features with different Start Dates in your file.