When connecting PVS 7.15 LTSR to MS SQL 2016, you’ll want to get the latest version of the SQL Native client which they have helpfully renamed to Microsoft® ODBC Driver 11 for SQL Server® – Windows.
https://www.microsoft.com/en-us/download/details.aspx?id=36434
Using the supplied 2012 client tools will result in you not being able to connect.