Hey there, I totally get your frustration when the "latest version" prompt doesn't match what you're actually seeing, and wanting a clean reinstall instead of messing with half-measures. Let's break this down properly, and address your Chromium concern too.

一、彻底卸载Google Chrome（覆盖主流系统） #

The key here is wiping all Chrome data and residual files—just using the standard uninstaller might leave leftover config that causes the same version mismatch issue later.

Windows #

• First, shut down every Chrome process: Open Task Manager, find every entry labeled Google Chrome, right-click and select "End Task" to make sure nothing's running in the background.
• Standard uninstall: Go to Settings > Apps > Apps & features, locate Google Chrome, click "Uninstall". When prompted, make sure to check the box that says "Also delete your browsing data"—this removes your local profile data along with the app.
• Clean up remaining files:
  • Open File Explorer, paste %LOCALAPPDATA%\Google into the address bar, delete the Chrome folder if it's still there.
  • Next, paste %PROGRAMFILES%\Google and delete the Chrome folder here too.
  • (Optional but thorough) Open Registry Editor (press Win+R, type regedit), navigate to HKEY_CURRENT_USER\Software\Google\Chrome and HKEY_LOCAL_MACHINE\Software\Google\Chrome, right-click these keys and delete them. Note: Always back up your registry before making changes if you're unsure!

macOS #

• Kill all Chrome processes: Open Activity Monitor, search for "Chrome", select every related process and click the "X" button to quit them.
• Uninstall the app: Go to your Applications folder, drag Google Chrome to the Trash, then right-click the Trash and select "Empty Trash".
• Remove residual data:
  • Open Finder, press Cmd+Shift+G, paste ~/Library/Application Support/Google/Chrome and delete this folder.
  • Repeat the shortcut for these paths and delete the files/folders:
    • ~/Library/Caches/com.google.Chrome
    • ~/Library/Preferences/com.google.Chrome.plist

Debian/Ubuntu-based Linux #

• Stop Chrome processes first: Run this command in the terminal to kill all stable Chrome instances:

  killall google-chrome-stable
  

• Purge the app and its config files:

  sudo apt purge google-chrome-stable
  

• Clean up unused dependencies:

  sudo apt autoremove
  

• Delete remaining user-specific data:

  rm -rf ~/.config/google-chrome/
  rm -rf ~/.cache/google-chrome/
  

二、关于Chromium vs Google Chrome的顾虑 #

You're right to be cautious here—let's clarify the difference clearly:

• Chromium is the open-source base that Google Chrome is built on, but it doesn't include Google's proprietary additions like the official auto-update service, full Google Account sync integration, certain media codecs, and Google's curated security/stability patches that are tested rigorously before being pushed to Chrome Stable.
• Google Chrome Stable receives updates directly from Google, which are rolled out after thorough real-world testing—so if you need the exact "latest Chrome updates" you're used to, sticking with the official Google Chrome build is definitely the way to go.

三、重装Google Chrome #

Once you've fully uninstalled and cleaned up all residual files:

• Head to the official Google Chrome download page, grab the installation package for your system.
• Run the installer, and it should set up the latest stable version from scratch—no leftover data to cause version mismatch prompts this time.

备注：内容来源于stack exchange，提问作者Jean Guillon