We do not support these issues like that. Please check our https://premiumkey.co/terms
We can provide some solutions to solve it by your self :
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Contact to download service to get help
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You can use forgot password or reset password to reset your account password
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If you did not activate your premium key yet, and you 2 above options are not available. You can try to create new account to and apply it (dont forget storing your password in safe place)