I did some dig around and found out that the newer WP or this plugin won't handle "post_name" in utf-8 properly which causes this plugin not to work.
if you post name is in plain English let's say "test 1", in the "post_name" field it will store "test-1"
However, if you post title is not in English, for example in UTF-8 format, in the "post_name" field it will show up something like this
which will cause custom permalink stop working.
I was wondering if the author would fix it.