We do not support these issues like that. Please check our https://premiumkey.co/terms
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We can provide some solutions to solve it by your self :
1. Contact to download service to get help
2. You can use forgot password or reset password to reset your account password
3. 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)