The platform is the most trusted name in portable software. They maintain a strict repository. While they usually host the latest version, they keep older releases in their "archives."
If you must use an older build, avoid random "third-party" sites to prevent malware. Stick to verified repositories: google chrome portable old version
chrome.exe --user-data-dir=".\Data" --disable-machine-id --disable-encryption The platform is the most trusted name in portable software