you can google to find an archive website. I have mentioned 2 of them here, though there are hundreds of them around.
0- choose the version you want to install by going to an archive website like this:
http://www.ubuntuupdates.org/pm/google-chrome-stable
1- In the Download section download the 64-Bits or 32-Bits package suitable for your OS ( or you can directly Press APT_INSTALL button)
3- Install the package using Ubuntu software center. you may need to remove the existing version first.
4- for disabling auto updates you can go to SystemSettings/ Software & Updates from Ubuntu applications Menu
Doing the same things command line:
I assume your user name is "user" you replace it with your username.
1- Browse the website http://www.slimjet.com/chrome/google-chrome-old-version.php or any other archive website.
2- Download a proper version of google-chrome ( I brought 49.0.2623.75 Linux_64)
3- Save the downloaded file in /home/user/Downloads
4- Open a console and execute the following commands:
user@host:~/workspace $ cd ~/Downloads/
user@host:~/Downloads $
user@host:~/Downloads $ sudo dpkg -i ./chrome64_49.0.2623.75.deb
of course you would replace the file name with the one you downloaded.
http://askubuntu.com/questions/243394/how-to-install-specific-versions-of-google-chrome-chromium
– Edlin