No specific info about version 6.3. Please visit the main page of RAR Extractor - Unarchiver Pro on Mac Informer.
The Unarchiver is an application for Mac to manage your archive files.
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
This program uses binary libraries to process archives and disk images.
Designed to help you extract the contents of RAR archives.