CASA of versions older than 4.7

CASA of versions older than 4.7

[The entire system][Data analysis servers(kaim* & kaih*)]

The OS of all computers in the Multi-wavelength Data Analysis
System (MDAS) is Red Hat Enterprise Linux 7 (RHEL7).

The earlier versions of CASA than version 4.7 are not supported
on RHEL7 and the behavior is not guaranteed.

Therefore, they cannot be installed on the MDAS.