If there is PHP error

Fatal error: Maximum execution time of 60 seconds exceeded

follow these steps to disable it

1. Open file wp-includes/functions.php

2. Find a line in the wp_get_htttp() function

@set_time_limit( 60 );

3. Comment it.

4. Also it may be necessary to set PHP directives for the max time in the php.ini

max_execution_time
max_input_time

5. Then restart the server.