Sometimes you need to disable the Steam Guard Mobile Authenticator, which is an app generating one time passwords to for the 2-factor authentication at Steam.
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Steam Failed to start game – Missing executable.
If you entered beta testing for a Steam game once, it continues to download beta builds even if you exit all beta programs in the Steam client application.
So, Steam is sending a code via SMS to your phone, but when you enter the code, Steam says the code is incorrect.
I must be an idiot, by it took me a long time to figure out you can’t activate those free Steam game keys on Steampowered website.
One of my viewers PMed me that Steam is giving away games he used to pay for last year for free.