How to get VCO version from exposed API, for VCO 4.2.x ?

As a developer, I have to write custom client code which has to be able to support different VCO servers.

For VCO version 5.1.X, I'm able to hit the server to https://vco_host:8281/api/versions and get:

However, If I try the same thing for a VCO version 4.2.x, I get a 404.

So, there is any way to get the VCO version from the API ?

Thanks,

Sebastian