it appears CA Support sees more questions via Support Chat asking for "where to find CABI" for CA Spectrum - or the "CA Spectrum Virtual Network Assurance" (aka SysEdge agent)?
When you login to the CA Support page and going to the Download Management area - here then to search for the product "CA Spectrum" and you click to the "Product Downloads Available" item. In this list please select "Service Pack" to "0" - which is the base install media list.
This brings you to the available media list which also covers the CABI and the VNA media.
Kind regards, Joerg