Wordpress Site
After you Moved the "wp-recaptcha.php"
you have to Edit the file to change Required's Path...
On Unix-like Systems you can simply edit your file with:
pico wp-recaptcha.phpChange 2 lines:
require_once('recaptcha.php') --> require_once('wp-recaptcha/recaptcha.php')
require_once('mailhide.php') --> require_once('wp-recaptcha/mailhide.php')
Now you can proceed to Install the System Wide Plugin :)