PHPMailer seems to not install correctly: Uncaught Error: Class 'PHPMailer\PHPMailer\PHPMailer - phpmailer

Question

I am getting the error above when I run my code. Following the instructions on the PHPMAiler Github page, I added "phpmailer/phpmailer": "^6.0" to my composer.json but PHPMailer seems not to load.
I tried using $mail = new PHPMailer\PHPMailer\PHPMailer(true) instead of $Mail = new PHPMailer(true). I went to the Composer IRC channel to see if my problem was with Composer. I have also tried using the full path in the require 'vendor/autoload.php'; statement.
// Import PHPMailer classes into the global namespace
// These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
//Load Composer's autoloader
require 'vendor/autoload.php';
//other code...
//Create a new PHPMailer instance
$mail = new PHPMailer(true);
I expect PHPMailer to run. Where did I go wrong?

Answer 1

When I had difficulty running PHPMailer on my local XAMPP server and the composer, I ended up installing the file manually by loading it into my directory
htdocs
-index.php
-Other_Program_to_run_with_PHPMailer.php
-folder(PHPMailer)
<?php
$messege=""
require 'PHPMailer/PHPMailerAutoload.php';
$mail = new PHPMailer;
//$mail->SMTPDebug = 3; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'smtp.gmail.com'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'insert Username'; // SMTP username
$mail->Password = 'insert Password'; // SMTP password
$mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587; // TCP port to connect to
$mail->setFrom('insert username', 'Information');
$mail->addAddress('who it is being sent to', 'PHP Management'); // Add a recipient
$mail->addReplyTo('who they can reply to', 'PHP Management');
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = ;
$mail->Body = $message;
if(!$mail->send()) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
echo 'The following Message has been sent';
echo $message;
}
?>
From there I have been copy and pasting onto my server and it works out pretty good.

Answer 2

Scott
Your problem may be solved if you would have read the documentations. Use the below code at first.
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
require 'path/to/PHPMailer/src/Exception.php';
require 'path/to/PHPMailer/src/PHPMailer.php';
require 'path/to/PHPMailer/src/SMTP.php';

Answer 3

just download the phpMailer Class from that GIT repo link
https://github.com/PHPMailer/PHPMailer
and extract/copy three files PHPMailer.php, Extension.php and SMTP.php files put them in a folder name : (PHPMailer) like in the image bellow :-
https://i.stack.imgur.com/T6DXW.png
and just add these lines of code at the top of your file
//Import PHPMailer classes into the global namespace
//These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;
//Load Composer's autoloader
// require 'vendor/autoload.php';
require('PHPMailer/Exception.php');
require('PHPMailer/SMTP.php');
require('PHPMailer/PHPMailer.php');