Can't auto-update wordpress and plugins

Hello!

I am trying to update my wordpress blog (v3.4.2) to the latest version but i get this error:

Downloading update from http://downloads.wordpress.org/release/wordpress-4.3.1-new-bundled.zip…

Download failed.: Could not open handle for fopen() to http://downloads.wordpress.org/release/wordpress-4.3.1-new-bundled.zip

Installation Failed

After some search here, I tried some solutions, like these:

1) Make sure that ‘wp-include’ and ‘wp-content’ directory set to 755 permission.

2)Add this line to the bottom of your “wp-config.php” file:

define(‘WP_TEMP_DIR’,ABSPATH.’wp-content/uploads/’);

from https://wordpress.org/support/topic/auto-upgrade-to-361-fails

Try changing the permissions on the wp-content directory to 766. If you still have problems, try 767, 775 or 777. Once your uploads are working, change the permissions on wp-content back to 755 again and check that everything still works OK.

from https://wordpress.org/support/topic/i-can-not-uplaod-or-install-any-thing-from-dashboard

In /wp-includes/class-http.php, you’ll find this code around line 145:

if ( ! is_writable( dirname( $r[‘filename’] ) ) )
return new WP_Error( ‘http_request_failed’, __( ‘Destination directory for file streaming does not exist or is not writable.’ ) );

Try simply removing or commenting out those two lines. Only those two lines, mind you.

from https://wordpress.org/support/topic/plugin-upgrades-fail-after-update-to-wp-35

is there anything else that I should try?

thanks!