Hello Jose,

I'm sorry but it is not possible to upgrade to version 11 from version 8. If you are interested in our special offers, I suggest you subscribe to our newsletter. 
Furthermore, i wish to inform you that with version 11 you can create your website using the mobile templates that have been created specifically for mobile devices. You will find a collection in the template gallery. 

Please feel free to download the demo version from our website if you like http://www.websitex5.com/en/demo.html in order to test it out.
Thank you,
Samantha

you will receive error mobile-friendly even if you create a website with website x5 v.11.

Hello Jose, Ro,

please have a look at the following post https://helpcenter.websitex5.com/post/116552#3

Thank you,

Samantha