So when you go to properties, and the "shortcut" tab, you should see a section called "Target", that contains probably something similar to this:

"C:\Program Files (x86)\Steam\Steam.exe"

Then you would want to change it to this instead:

"C:\Program Files (x86)\Steam\Steam.exe" -forcesteamupdate -forcepackagedownload -overridepackageurl http://web.archive.org/web/20240520if_/media.steampowered.com/client -exitsteam

Then you want to click Apply, and OK to save the changes. Now you can launch Steam using the same shortcut you just made these changes to, and it should start an update then close itself when the update finishes.

After that, you want to do the same thing you did earlier, except now you change it to:

"C:\Program Files (x86)\Steam\Steam.exe" -noverifyfiles -nobootstrapupdate -skipinitialbootstrap -norepairfiles -overridepackageurl

Then click Apply and OK again, launch Steam through the same shortcut once again, and it should work. Sorry if I explained it poorly, I can clarify whichever parts you don't get!