Cant join beta??

[SaulJH]

Followed instructions here, but;
There is no such option...

I'm on a v4 build, v4.120, to be precise.
And the latest stable build of Windows 10

[SaulJH]

Anyone? TY.

[BOXCUTTER]

Have you found a solution?
I have exactly the same problem!
f.lux does not want to update to latest BETA.