He has a link to the source code for version 0.02 on his website, if you have any programming experience you might be able to convert it.
http://www.pepak.net/download/chromepass/
(Yes, the page is Polish and I can't read it, but it does say BSD license, and when I hover the link "zdroják" the file title is http://www.pepak.net/files/tools/chromepass-0.02-source.zip so ... oh, and there's a contact form on the page as well, so I suppose you could write him and ask.)