Hi @taroanyway,
I agree with @cryptex_vinci using nulled plugins are very dangerous.
Reasons you shouldn’t install nulled plugins and themes … You Don’t Know What Else Is in the Code, Developers Need Money To Continue Improving Their Products, You Won’t Get Any Support From The Developer, You Won’t Get Any Automatic Updates.
I have the paid version of Ultimate Member plugin with all of the extensions, plus I have integrated Ultimate Member with ForumWP and Restrict Pro, also paid plugins. They all work seamless together. I would advise to use the free version to test it and if you really want the paid version it’s worth it. For the paid version they can only provide support via their website, but everything is straight forward.
Again I would for sure advise against using a nulled version.
https://kinsta.com/blog/nulled-wordpress-plugins-themes/