I’m trying out the demo content, but I could not

I already add: set_time_limit (180); and define ( ‘WP_MEMORY_LIMIT’, ’256M’); in
my file wp-config.php

And install the plugin WordPress plugin to reset the database and delete the entire contents of the folder Uploads but nothing works

The error I get is:

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Internal Server Error
The server Encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@aliciarecreacion.aliciarecreacion.com and inform them of the time the error occurred, and anything you Might Have done that May Have Caused the error.
More information about this bug May be available in the server error log.
Additionally, a 404 Not Found error was Encountered while trying to use an ErrorDocument to handle the request.
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Thanks for you help!

It would be best to contact the Admins (your hosting provider) and ask them for assistance just like the error says as “Internal Server Error” is usually not what you get if your server limitations are reached. Simply explain the problem to them and ask them to see what the error is. It might be that they have some further limits on a lower level.
Here’s more info on what needs to be increased in general:

http://blueowlcreative.com/support_wp/forums/topic/fortuna-install/

Let me know if I can further help!