The Tor Project does officially distribute the Tor Browser in .rar format. While you may find third-party sites offering "Tor Browser Portable.rar," downloading from these sources is highly discouraged due to significant security risks, including malware or compromised privacy.

If the main site is blocked, use official mirrors like EFF or GetTor via Telegram.

It is highly recommended to verify the download's signature to ensure the file hasn't been tampered with.

Some unofficial versions may be hardcoded to use malicious exit nodes that can inject content or steal data. Official & Safe Way to Create a Portable Tor Browser