Stable Version Release Date?

Feb 15, 2016
I'm a little bit lost.
How does work ota under lorax rom ?
I'm under 7.1.6 stable and 7.1.8 is out now.
My bootloader is unlocked. Only twrp isn't installed yet.
On, I just find flashtool rom. And for the moment I can't flash anything due to the old computer of my wife 's mother.

Does the ota works as official miui ? With update tool or have I to install twrp to get them ?

I'm quite familiar with android but it is my first miui product.

Thanks for all