Doesn't work with permalinks enabled.

I’ve had this plugin working just peachy-keen for a while on my site that didn’t use permalinks.

Today, I enabled permalinks, set permalink type to Post name, and now get the file not found errors for my login and register pages.

Luckily, I was logged in on another workstation,so I could still access my wp-admin and turn-off permalinks (Set back to default)

After disabling permalinks, the login and register pages work again.

https://wordpress.org/plugins/rename-wp-login/