Downloading old builds of Chrome / Chromium
Let's say you want a build of Chrome 44 for debugging purposes. Google does not offer old builds as they do not have up-to-date security fixes.
However, you can get a build of Chromium 44.x which should mostly match the stable release.
Here's how you find it:
Look in https://googlechromereleases.blogspot.com/search/label/Stable%20updates for the last time "44." was mentioned.
Loop up that version history ("44.0.2403.157") in the Position Lookup
In this case it returns a base position of "330231". This is the commit of where the 44 release was branched, back in May 2015.*
Open the continuous builds archive
Click through on your platform (Linux/Mac/Win)
Paste "330231" into the filter field at the top and wait for all the results to XHR in.
Eventually I get a perfect hit: https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Mac/330231/
Sometimes you may have to decrement the commit number until you find one.
Download and run!
- As this build was made at 44 branch point, it does not have any commits merged in while in beta.
Typically that's OK, but if you need a true build of "44.0.2403.x" then you'll need to build Chromium from the 2403 branch. Some PortableApps/PortableChromium sites offer binaries like this, due to security concerns, the Chrome team does not recommend running them.