http://learn.elgg.org/en/2.0/admin/duplicate-installation.html

If you are only changing the site URL:

http://learn.elgg.org/en/2.0/admin/duplicate-installation.html#change-the-site-url

Or change the site URL via Admin Settings page.

Otherwise, you need to follow the duplicate installation process.

Hello, thank You.

@RJ (Arvixe) I have done it, but now I get an error: 

Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /homepages/22/d36192043/htdocs/elgg-bienen/vendor/elgg/elgg/engine/classes/Elgg/Di/ServiceProvider.php on line 99

 What is wrong?

Best regards

Kai

Hello, everything is okay; I have forgotten to set the right php version.

Thank You for helping

Kai

PS: Another question: Do I have to change also the installation path, data path and filstore directory?

There is another problem: I cannot see the http://www.imkergruppen.de/file/all. Also there are no pictures in the overview.

Thank You

Kai

Could someone please move this discussion out of Professional Services. I keep getting notifications about it.

Moved to tech support

If you haven't changed the path to the Elgg directory or data directory on the server, you don't need to make any changes for these entries.

But you might need to flush the Elgg site cache after the change of the site url as the old url might still be within the cached pages at the moment.