It seems you are using the old version of ACF. ACF has version 5.4.6 now. If you can’t update it, could you please check if your domain is activated for your license? You can check it out by logging in at https://www.advancedcustomfields.com/my-account/. If you can’t find it on the list, could you please deactivate and activate the license from “wp-admin > Custom Fields > Updates”?
If that doesn’t help or if you get an error, could you please check if your server is working behind a proxy or firewall? Could you please test the connection from your server, not your local machine, to connect.advancedcustomfields.com? I believe you can ask your hosting to test it by pinging that address from your server. If your server doesn’t block the connection to that address, could you please ask them the outgoing IP of your server and open a new ticket here: https://support.advancedcustomfields.com/new-ticket? Maybe it’s blocked on ACF server.
For now, you can also get the latest version of ACF by logging in at https://www.advancedcustomfields.com/my-account/ and then update it manually.
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