Hi,
I have checked System > System Information > Folder Permissions all folders writable
I have FTP'd zip and extracted on server as well as extracted .zip locally and FTP'd to folder on server
In Joomla: Extensions > Manage > Install > Install from Folder
Entered my path: /home/******/public_html/tmp/hikashop Click "Check and Install"
So, I open libraries/joomla/filesystem/folder.php search for
return JError::raiseError(-1, JText::_('Copy failed'));
This file must have been changed as that line does not exist in that file...
Rgds,
Petter