When trying to install Spectrum on a CentOS 7.1 the installer is complaining that I am not installing it on a supported version. Why?
Installer is getting info about the OS version from /etc/redhat-release. To work around the issue and to allow the installer to continue the installation you should change the string there from "Derived from Redhat ..." to "Redhat version...."
Additional information about Spectrum and CentOS can be found on https://docops.ca.com/ca-spectrum/10-1-and-10-1-1/en/frequently-asked-questions and TEC1533903, TEC1795273