How to make a new account on minecraft with out downloading/paying for it again?

How to make a new account on minecraft with out downloading/paying for it again?
Added (1). i have a account that i made years ago for minecraft and then i got a new MAC and i go on it and its fine for like 2 years but then i want to change my skin so i go on the minecraft web so change it but then it says that i need to answer the questions because i have not been on the minecraft web on this MAC before (which is a lie) but because the the email was from long time ago so that i forgot the password and the questions so i cant change my skin or do other important stuff what i do?

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