The last resort (though, not actually) is to remove the Google key from your Registry:
after it’s done, see if you can install Google Chrome if no, then go back to %localappdata%\Google\ but this time delete everything, every single folder. now select the Update folder and hit “Delete” on your keyboard,. 
press Win+R, then copy/paste %localappdata%\Google\ and click OK,. 
If nothing helps you can also try to delete the Google and Google Update folders:
download and install one of the stable versions of Chrome for Windows 10 or Windows 11. make sure the Background Intelligent Transfer Service is running: press Win+R, type in mcs, right-click on the Background Intelligent Transfer Service, select Properties and set the Startup type to Automatic,. temporarily disable antivirus software and firewall,. right-click on the installation file to open the context menu, and choose “Run as administrator”,. run Microsoft’s Install and Uninstall Troubleshooter anyway, even when the error code is not 1603 or 0x00000643,. If you get an error message when you try to install Google Chrome, try these fixes one by one: 4 – a newer version of Chrome is already installed on your computer,. 0x80070070 – free up enough space on your system disk,. 1603 and 0x00000643 – run Microsoft’s Install and Uninstall Troubleshooter,. How to fix Google Chrome installation failed You’ll be redirected to “Default Apps”, and you know what to do there.
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