I had the same issue so here is what I found in case it helps:
On www.chromium.org/getting-involved/download-chromium, it is written “you can get a build of Chromium 44.x which should mostly match the stable release” and “sometimes you may have to decrement the commit number until you find one”.
I searched the latest version number (which is currently 94.0.4606.81) on omahaproxy.appspot.com/ but cannot find its build number (911515, known as Branch Base Position on the previous link) on commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/.
So I decremented the number until I find one matching, like explained previously and I found 911494: commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/911494/
When I downloaded this Chromium version, in “About Chromium”, it displayed “Version 94.0.4606.0 (Developer Build) (64-bit)”. Which almost matches 94.0.4606.81.
On githubmemory.com/repo/Bugazelle/chromium-all-old-stable-versions/issues/2, I read “You cannot install a stable Chromium version downloaded from chromium-browser-snapshots because there are absolutely no Chromium stable versions there.” and “It is recommended to compile Chromium yourself to have a similar stable version… or find third-parties builds.”.
Linux distributions like Ubuntu provide a stable Chromium package. Otherwise if we don’t want to compile the stable version, we can get the closest developer version like explained previously.
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