That error means the docker version available on CentOS 7 (1.13.1 at the moment) is older then the one required by our docker-compose package (>= 18.06.1).
I need to look into our docker-compose package, if we need >=18.06.1 - probably, as I think I did not make up the number ;). Maybe we can provide an older docker-compose, which supports the docker version in CentOS and the features (docker-compose file-format v3) we need.
One thing you can try right away is to install Docker-CE:
If (!) that provides “docker”, you should be able to continue with our installation.
I will look into CentOS 7 again, for our next maintenance release expected for this week.