Two versions of the patch exist for versions 1.10 and 2.10. I added the link to 2.10 as the official site. Version 1.10 can be found [url=https://web.archive.org/web/20140910190634/http://www.hongfire.com/forum/showthread.php/107485-Mod-Release-amp-Technical-Discussion-Thread-(Interheart)-Itazura-Gokuaku?p=1902966]here[/url].
In order to use 2.10, official 2.0 patch must be installed first.