Hi Andrei 
thank you for help
so what I should do ?
from this tutorial: https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-14-04
After I am done with this tutorial what certificate will be installed ? latest or ?
or I have a choice?
because it would be great if it can work for Win XP sp3 users
thank you