SaltStack Enterprise 5.3 was released Jan 30, 2018.
The following link will provide the latest installation instructions for the most current release of SaltStack Enterprise:
Evaluation Period is 14 Days
SaltStack Enterprise (SSE) has a native licensing mechanism.
An installation of SSE without a License Key-File (LKF) is an Evaluation-Installation. The evaluation period of SSE without a LKF is 14 days.
At day 14, an installation of SSE that does not have a LKF applied to it will stop running.
Upon the application of a LKF to an Evaluation-Installation of SSE, the configured Evaluation-Installation will resume operation as a Licensed instance of SSE for the period defined in the LKF.