Hello team and colleagues

I am facing a huge issue regarding my website setup.

I'm using the version 11, to update my products and stuff.

When I export the website to the internet, it is terribly broken.

If you access the site at http://www.flamingbike.com.br,will see what I mean

The left side menus are broken, the images are broken, and the values are not updating at all.
I am trying to get some assistance from the  ISP company, but so far, was not able to fix that.
I don't know if it is related or not, but in the past, I was using version 10

Maybe from that version to the 11, there are some huge differences
Should be that the reason to see my website broken?

If so, could you send me the link to download and install the version 10?

Please let me know
Thanks in advanced

Best

Fabio