The latest version still gives the message: Your phpBB installation is not up to date.

Within the phpBB admin panel, the message "Your phpBB installation is not up to date." appears in a red bar. in a red bar. This is caused by text received from the phpBB server not arriving in a proper format.

This is solved by adjusting a few lines within the phpBB code.

Find the functions_admin.php file in the includes folder and open it in a text editor (e.g. filemanager or via FTP). In it, look for the function "obtain_latest_version_info" and replace the following two lines:

$info= get_remote_file('version.phpbb.com','/phpbb',
((defined('PHPBB_QA'))?'30x_qa.txt':'30x.txt'),$errstr,$errno);

With this piece of code:

$curl=curl_init();
curl_setopt_array($curl,array(
CURLOPT_RETURNTRANSFER=>1,
CURLOPT_URL=>'https://version.phpbb.com/phpbb/'.((defined('PHPBB_QA'))?'30x_qa.txt':'30x.txt')
));

$resp=curl_exec($curl);
$info=$resp;

curl_close($curl);

Save the file and let the admin in again. This will fix the problem and therefore the message will no longer be displayed.