How to Downgrade the Steam Client and Block Updates
22The following is a method for downgrading the Steam client and blocking updates.
Here's an alternate, easier method which uses launch options and an Internet Archive backup of the packages from May 31st (I haven't tested this yet) - https://www.youtube.com/watch?v=edWh0HsWWFY
The latest update introduced bugs for many users including crashing, high system usage, display scaling issues, and such. Some I've reported months ago weren't fixed before release.
Blocking updates has also let users continue to use Steam on Windows XP and should let you continue to use it on Windows 7, 8, and 8.1 once support is dropped for those operating systems.
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https://github.com/SteamDatabase/SteamTracking/
https://www.bulkrenameutility.co.uk/Download.php
https://steamcdn-a.akamaihd.net/client/
steam.cfg - https://pastebin.com/eEzBmYBW
April 27th Steam packages cdn links - https://pastebin.com/9nPnN0Qt
I wrote a small script for myself in R to automate the link generation when I was doing this - https://pastebin.com/zvLBxHYE
https://cran.r-project.org/bin/windows/base/
If you want to convert this to Python or even better, a batch script, feel free, and I'll add it to the description.
Blocking updates can be done the same way for the MacOS and Linux clients. The steam.cfg file must go in the same folder as your Steam executable.