1) Download Steam Desktop Authenticator program, such as download (There is others you can look online)
2) Download mafile from your order
3) Open the authenticator program, go to File -> Import Account -> Select the mafile
4) It will ask for the login, enter the steam login
5) You should now receive codes in the program

Keep your .mafile file safe, dont delete it, keep it.

This is not recommended but if you wish. If you remove it, there is no warranty for a community ban!

1) Follow the first instructions on "How to use mafile"
2) Go to "Selected Account" menu in the authenticator, there will be an option to "Deactivate Authenticator"

1) Follow the first instructions on "How to use mafile"
2) In the Steam Desktop Authenticator once setup click "View Confirmations" there will be accept/reject option

Community bans started appearing on accounts, this prevents it.

maFile is a special file generated by the SDA, which stores necessary data about a steam account, that allow you to control your steam account fully automatically (such as confirming steam trades automatically without the need of manual confirmation in the SDA app or a passwordless login etc.)

Option 1) On your order use the "Get steam guard code" button
Option 2) Follow the first instructions on "How to use mafile?" then in the authenticator there will be code.