Yii2 is already installed on the hosting, how to put widgets from krajee on it?

Question

Yii

I put the kartik-v folder in vendor.

<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
use kartik\datecontrol\Module;
?>
  <?= $form->field($model, 'dateAdd_patient')->widget(DateControl::classname(), [
    'type'=>DateControl::FORMAT_DATETIME
  ]);
  ?>

Writes that the class is not found Class 'DateControl' not found.
Tried with composer

$ php composer.phar require kartik-v/yii2-datecontrol "dev-master"
CreateProcess() failed with error code 2:
Не удается найти указанный файл

I have not tried this method:

or add:
    "kartik-v/yii2-datecontrol": "dev-master"
to the require section of your composer.json file. Then run:
    php composer.phar update

because I don't understand where specifically to make the entry "kartik-v/yii2-datecontrol": "dev-master".
source

Answer 1

Could not open input file: composer.phar
Well, they tell you in plain text what the problem is.

Answer 2

https://getcomposer.org/doc/01-basic-usage.md
try composer update after composer.json changes