No specific info about version 2.1. Please visit the main page of Oka Unarchiver on Mac Informer.
The Unarchiver is an application for Mac to manage your archive files.
StuffIt Archive Manager organizes your archives into collections.
Create, convert, and extract archive files on your computer.
Program that lets you browse the contents of archives, as well as extract them.
Best Mac archiving tool to preview, compress and decompress Zip, 7z, Rar files