can't get my phone to debug mode

so i had an issue with my windows 8 and i figured i try windows 7 on my laptop cause i been on 8 or 10, later i worked on my lg g3 and trying to get debug mode to work, every time i connect my lg to my laptop i do not get that allow access message when debug is turned on, i can't remember what was required to get it going, i have drivers installed, is there anything else i need, thanks

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