steamctl VS SteamDesktopAuthenticator

Or also you can check this or this github repositories, which emulate steam client (Or any other, there are lots of them)

Do you have to give them your phone number? Can't you just add 2FA without the phone number part? You can use a tool like steamctl to use 2FA with your authenticator app of choice as opposed to using their app: https://github.com/ValvePython/steamctl

You need to switch to https://github.com/Jessecar96/SteamDesktopAuthenticator because if you check the WinAuth last update, it's from 2017 so it was bound to break eventually like it did on you but this project got updated last week to catch up with latest Steam update.

WARNING: This is not mine, it looks old and is general a security risk SteamDesktopAuthenticator

If you want to re-enable 2fa without that dumb app, you can download / install: https://github.com/Jessecar96/SteamDesktopAuthenticator

You can export your code from Steam Guard using the github project Steam Desktop Authenticator and exporting the code to your software 2FA of choice.

Heres the link to SDA https://github.com/Jessecar96/SteamDesktopAuthenticator and incase you need it heres the steam multi sell link https://steamcommunity.com/market/multisell?appid=730&contextid=2&items%5B%5D=Operation%20Hydra%20Case&items%5B%5D=Operation%20Wildfire%20Case&items%5B%5D=Revolver%20Case&items%5B%5D=Shadow%20Case&items%5B%5D=Falchion%20Case&items%5B%5D=Chroma%202%20Case&items%5B%5D=Chroma%20Case&items%5B%5D=Operation%20Vanguard%20Weapon%20Case&items%5B%5D=eSports%202014%20Summer%20Case&items%5B%5D=Operation%20Breakout%20Weapon%20Case&items%5B%5D=Huntsman%20Weapon%20Case&items%5B%5D=Community%20Sticker%20Capsule%201&items%5B%5D=Sticker%20Capsule%202&items%5B%5D=Operation%20Phoenix%20Weapon%20Case&items%5B%5D=CS:GO%20Weapon%20Case%203&items%5B%5D=Sticker%20Capsule&items%5B%5D=Winter%20Offensive%20Weapon%20Case&items%5B%5D=eSports%202013%20Winter%20Case&items%5B%5D=CS:GO%20Weapon%20Case%202&items%5B%5D=Operation%20Bravo%20Case&items%5B%5D=eSports%202013%20Case&items%5B%5D=CS:GO%20Weapon%20Case&items%5B%5D=Prisma%202%20Case&items%5B%5D=Prisma%20Case&items%5B%5D=Danger%20Zone%20Case&items%5B%5D=Spectrum%20Case&items%5B%5D=Gamma%202%20Case&items%5B%5D=Gamma%20Case

If you're fine with not using the Steam app, you can use Steam Desktop Authenticator to acquire the TOTP secret, then transfer the mobile authentication file to your device.

Nope! Here's how: https://github.com/Jessecar96/SteamDesktopAuthenticator