Just not working

I installed the plugin and created a link, but I can’t get it to work. Going to the cloaked link (mysite.com/refer/link) brings up a Not Found error, not even a 404.

I host my site on my own Raspberry Pick and I can see there is no /refer/ folder. Do I need to create one? If so, do I need to add any files into it?

I already tried deactivating and reactivating the plugin, hitting save on the permalinks settings, and still no luck.

Any help is greatly appreciated.

https://wordpress.org/plugins/thirstyaffiliates/