Downgrading Google Chrome version after disabling auto updates

I wish to keep using a particular version of Google Chrome macOS app. I have used [this](https://discussions.apple.com/thread/7812708?answerId=32299371022#32299371022) link to stop Google Chrome macOS app from auto updating. But, the problem is that I stopped auto updates while running version 75. I need to run version 70. I am also unable to revert back the changes which I made. Could anyone please help me in resolving this issue?