I've installed my forum at forum.mysite.com, and my Wordpress install is at mysite.com -- I'm getting the "Couldn't find a Vanilla Forum at this url " error when I try to setup the Wordpress plugin.
There are many discussions covering this issue
❌ ✊ ♥. ¸. ••. ¸♥¸. ••. ¸♥ ✊ ❌
Do you have the latest version of the WordPress plugin?