You are in upstair, please come down/get down.
neither is ok, please state the correct form.
If you are upstairs and the other person is upstairs: Please go downstairs. If you are upstairs and the other person is downstairs: Please come upstairs. If you are downstairs and the other person is downstairs: Please go upstairs.
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If you are upstairs and the other person is upstairs:
Please go downstairs.
If you are upstairs and the other person is downstairs:
Please come upstairs.
If you are downstairs and the other person is downstairs:
Please go upstairs.
If you are downstairs and the other person is upstairs:
Please come downstairs.
CJ
You are upstairs. Please come down.
Or just say simply Please come downstairs. He already knows he is upstairs!