When attempting to activate the template I received the error:
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /home/*****/public_html/*****/wp-content/plugins/hikari-internal-links/hikari-tools.php on line 18
I got the same error when I attempted to install the add-in on a clean, new wp installation.