If you want to download as videos itself, you can use other free tools like Free Youtube Download to download all videos with a single click. Please be careful while installing this tool as it optionally installs a browser toolbar and modifies search preferences. So please make sure you read and uncheck the optional checkboxes while installing to avoid surprises in your browser. 
Step #7. When you have got the code just type it to the verification code area on the next step. Now press on Verify to confirm your phone number. Anytime, if you want to login into your account from different computer then google will send a verification code the this number and it should be with you. If the phone number is a fake number so you cannot verify your account with that number. So keep in mind that you should not make fun of google.
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