For installation instructions see Install Spotlight Enterprise.
The Spotlight Enterprise installer can be used to upgrade to Spotlight Enterprise from Spotlight on SQL Server Enterprise 12.4 or later. To upgrade from an earlier version of Spotlight on SQL Server Enterprise than 12.4, upgrade to at least version 12.4 or later first. To upgrade from Spotlight on SQL Server Enterprise 10.5.0, first upgrade to 10.5.2 following to that upgrade to 12.4 and then upgrade to the latest version of Spotlight Enterprise. For upgrade instructions see Upgrade Spotlight Enterprise.