At the time for write the article (dated 21 Jul, 2016), BeyondInsight (formerly Retina CS) 5.8.1, Retina Network Security Scanner 5.24.2 is the latest build and version.
Manufacturer do not have active policy to publish end of life and end of support like Microsoft.
Below is the official reply from manufacturer for those who concern about the product end of life and end of support
“As it pertains to end of life, if you have a current support contract with BeyondTrust, you will receive a notification at minimum 6 months in advance of the product’s end of life.
In the details of this ticket you’ve indicated the version of BeyondInsight is 5.8.1. Rest assured this version will be supported for the forseeable future. Again, if there is any change, you will receive a notification at minimum 6 months in advance provided you have current support contract. I have attached a white paper addressing this. See attached. “