How downgrade Google Chrome

Hello,

I'm trying to use the IKEA Kitchen Planer, but it seems that tool only run correctly on a 32-bit browser: The planner starts, but I can't log in or create a new account to save my plans ( a gray, empty box appears, nothing happens... ). Someone knows how to downgrade Google Chrome to resent versions, which one I need ( I'm actual on version 52.0.2743.116 ( 64-bit ) ) or a trustful site to download older versions?

Many thanks!