The binaries will be available at:

https://public.cyber.mil/stigs/scap/ in the SCAP Tools section.
https://cyber.mil/stigs/scap/ in the SCAP Tools section.
https://cyber.smil.mil/stigs/scap/ in the SCAP Tools section.

Primary changes from 5.3.1 to 5.4

* For All Platforms
* Updated SCAP content to January 2021
* Improved SSH remote scanning, fixing several issues with 5.3.1, especially with RHEL 7 and Solaris remote targets.

* For Windows
* Fixed several small bugs with ntuser tests and file tests

* For Linux
* Added support for SLES 15, Red Hat Enterprise Linux 8 and Oracle Linux 8