So a Security Plus License with AnyConnect APEX provides more features than AnyConnect Plus.
For instance, it implements Stateful Active/Active Failover providing up to 5 Security Contexts
2 Security Contexts are added by default. Additional Licenses are needed for more Sec. Contexts.
The CCNA Security Exam doesn't include Stateful Active/Active Failover. But this Topic is part of the CCNP Security Exam! Therefore, an upgrade to ASA 5515X with Security Plus Lic. would be recommended if you plan to move on to CCNP Security later on.
This item comes loaded with the latest IOS (ASA IOS) and latest ASDM Software
It also includes the Cisco AnyConnect Client (for Windows, Mac and Linux) Version 7.9.1