pem.to.pkcs12.keystore.certbot.hook.sh in NXT 1.12

Ardor and Nxt Wallet Users
1

pem.to.pkcs12.keystore.certbot.hook.sh

How do you use this in older NXT versions? It doesn't seem to be in my clone respository of ... SIGH.
rather I find a MacOS "keystore" file which means I cloned from some #%(&# repository ...