Since software versions update frequently, you can find the specific or the latest stable version at these trusted sources:
Even if you prefer 6.03, newer versions like RAR 6.10 offer better support for non-Unicode file names and improved security. Download File 6.03 Portable.rar
Sites like PortableApps.com often host clean, pre-packaged versions of popular utilities for mobile use. Since software versions update frequently, you can find