It might be a good program, but as a pre-release, it’s useless. Cannot specify drive/folder to work in for starters. There is no internal help file at all.
This is pretty good. Unlike others, it supports drag and drop. Not so fully-featured, but has the basics. The rename template has [N] placeholder for original name, [C] for counter, and [E] for extension. Some of the placeholders support extra options. THe documentation is not available in English as far as I can tell.