THIS STILL HAPPENS: You've downloaded the right version of Chromium, but it refuses to unzip without a corruption notice. We don't know what the devs are using to Zip the file, but it's NOT standard. Apple's Archive Utility can't handle it. Therefore, you have to use a compatible UNzip app. The only one I know of that works is Unarchive, part of Parallel Tools. If you discover another, please post! - - Shame on the devs.
Still too much Google snooping in Chromium. You're better off getting Ungoogled Chromium instead. It requires a plugin to use the Google Chrome App Store, but well worth it if you value your privacy and sanity.