Aha, thanks for that! It's missing from the manual edit instructions FYI.
To those who needed to know, to prevent the display of who an in-use email address belongs to, open
register.js and find:
Code:
LoginStatus('email_1','email_1_status',null,'0', results[0] + ajaxreg_name_inuse + ' by ' + results[1]);
Replace it with:
Code:
LoginStatus('email_1','email_1_status',null,'0', results[0] + ajaxreg_name_inuse);