The latest version will be found from http://www.rainlendar.net. You can also find new languages and skins from there. You may also send comments and bug-reports to the author. But before you do, check the Rainlendar's section in the Forum. It might already contain answers to your questions.

Please put the name of the product (i.e. Rainlendar) in the subject-field of the mail. It may be useful if you write the version of the product also. If you are reporting a bug, please try to be as exact as possible when describing the symptoms. Also write down the details of your system (like OS version, Litestep build, and so on).