As far as I understand, if you did a clean install of 10147, you can't get it. If you did a upgrade from a public build (10130 at least), you can upgrade.

That's what my frantic research the last...

Yeah, that's not a problem. Just sitting in a hotel here, going to sleep soon. Would've been perfect to wake up to 10158 done and upgraded.

Yeah, it was a clean install, I guess that's the problem

Can you just change from slow ring to fast, and use Windows update, just like that, no trickery?
Even changing it in the registry doesn't help for me. Automatically reverts back to "disabled".
And...

It seems like there is some kind of split. I, and several others, can't upgrade from 10147 to 10158. Running WIndows Update automatically disables Insider Builds :(

It isn't actually "old style", it is part of there "new style" logos. Have been used many times before