Activation

Hi, I get dlight license, and I activated on my first computer, it's working, then for some reason, I need to use dlight on another computer, it is said I need Deactivate the software on my first computer, and then activate on second one. But I forgot deactivate, and dlight is working on another computer by activating it by my friend. Now my first computer is in demo mode, I couldn't activate it even if I deactivate the software on the second computer. My question is how I can activate my first computer again. Can anyone know this, THX

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