Install using defaults is grayed out during Jasper 6.3 installation.
This is caused by a unconfigured/misconfigured /etc/hosts file
The fix is to resolve the errors in the /etc/hosts file.
The hosts file should have localhost properly defined.
It should also have the hostname with IP defined.
Example of a bad hosts file:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
127.0.1.1 hostname.ca.com hostname
It should have the proper IP on line 2:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
192.168.1.127 hostname.ca.com hostname
Restart the installation and the option will no longer be grayed out.