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I am not sure where you are downloading the driver from, but you do NOT need a password to download the driver from www.amd.com/drivers.
Go to the link above and fill out the selector options to download the latest driver for your GPU.
Since you have not responded to the previous response, I am closing this thread.
If you are still experiencing this issue, feel free to open a new thread, following the guidelines here : INFORMATION REQUIRED WHEN POSTING A QUESTION