Ndless 3.6 can be installed on any hardware revision, but nlaunch(y) can't. That's why you can for example install Ndless but not have it reboot-proof, or why you can't have a CAS OS on your non-CAS calc. But at worst,
KhiCas is out now and lets you use a CAS on any Ndlessed calc. You'll just not be able to use programs that need the CAS OS.
Also, welcome to Omnimaga, you can introduce yourself
here