Hi,
we have purchased your template:
demo.joomlaplates.com/#Rooms
and we have installed without any issues but this is the result:
lamp-pre.upcnet.es/naz_cim/
We don't know how to make it look like the example above. Is it because there is something not well installed or just because the final look is not the one of the example? Is there any guide where we can read about it?

Yes youre right, because you have only installed the template and not the whole content.
But please take in your mind, we are selling templates and not complete websites.

And if you want to have the same look and feel like our demo server, you have to install the demo content. ( quickstart package)
www.joomlaplates.com/support/documentation/install-demo-content

If youre not able to install the demo content or have no experience you can pay for professional
installation too.
www.joomlaplates.com/installation-service