VERIFIED SOLUTION i

How to find out if you can activate different versions of MapInfo Pro on the License Server Utility

You cannot run multiple License Server Utilities on the same machine but you can activate different versions of MapInfo Pro on the License Server Utility.

For example, you can activate your license for MapInfo Pro 15 on your License Server if you have already activated your license for MapInfo Pro 11.5.
UPDATED:  October 19, 2017