@matelo, you might try logging in to your hoster and see if they allow access to your WordPress site the way that Bluehost does. You can access “WordPress Tools” after logging in to Bluehost, and then going to your sites “Plugins” tab, and then turning off the HC Custom WP-Admin URL. Once it is turned off, you should then be able to access it once again from the http://www.yoursite.com/wp-admin URL. Search for a new plugin and install it as you did this one to change the URL back to your preferred login URL.
If you aren’t using Bluehost, and your hoster doesn’t have a WordPress Tools-type option, I would just contact the hosting company and ask them to change it back to the WP-admin for you… Your credentials will still remain the same.
On a side note – it may take a little time before the wp-admin URL kicks in… so, don’t close out of your hoster right away. 🙂
Also, once you get into your WordPress dashboard, be sure to go back into your settings, permalinks, and make sure it no longer has the old slug in there. IF it does, be sure to adjust that back to the wp-admin until you get a new URL changer in place; whether you use Jetpack, or SemperFi’s All-In-One comprehensive security or some other more basic URL changer… Be sure to look for a plugin that is being maintained NOW and not an abandoned one.
@matelo @dexspicer There is a new version that solves this bug.