Thank you for your answer.

I'm confused how 10586 is not Insider build? I mean, wasn't it Insider build before it rolled out for "outsiders" as RTM?

I'm in Insider program and I got it through...

My motherboard died, and I had to get a new one. I bought the same model. The rest of hardware on my PC remained the same. After that upgrade my Windows 10 isn't activated any more.

I don't have...