Originally posted by lightwo:

Hmm. I might consider adding a section for third-party archives and greatly emphasise the potential risks for this, or share some other way, or leave it here as-is.

The reason all of the archives in the big table source Wayback Machine is that, as far as I know, unprivileged users can only request for their servers to save a copy, which in a way ensures that the data hasn't been tampered with.

It is the reason I don't feel very comfortable sharing personal archives, since anyone who cannot manually verify them shouldn't even try using them for sake of security, and those who can would have a lot of work to do.

Thank you for sharing, however this can provide limited utility at best as it is more than likely that the older versions are half-functional, if at all.

Well the modern (non-extracted) files are directly from Steam. They're file.zip.sha1. You can compare the SHA1 numbers of the files with the name and if you want more, the SHA2 numbers of the files in the SteamDB manifest archive.
https://github.com/SteamDatabase/SteamTracking/commits/master/ClientManifest/steam_client_win32

I've been maintaining this for a while. I originally began in early-mid 2020, and stopped in early-mid 2021. I resumed archiving clients in early 2023, and have continued archiving them since. They're organized into folders based upon the the "eras" of the clients. To extract them, have 7-zip or similar extract all the zip.whatever files into a single folder, add steam.cfg and run.

mega(dot)nz(slash)folder(slash)GRlSCZwY#0qCL7SJkYllwkSr8RAZMYg