How to install vkcom/vk-php-sdk library?

Question

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Hello. I have a problem:
I installed composer, installed vkcom/vk-php-sdk with composer-php7.1 require vkcom/vk-php-sdk included require_once __DIR__ . '/vendor/autoload.php';
But nothing works. When creating an object

$vk = new VKApiClient();

Gives an error message:

Fatal error: require_once(): Failed opening required

What am I doing wrong? The manual says just install and create an object. There is nothing superfluous =(
I wrote to VK technical support, they answered me that they are not very versed in their libraries...

Answer 1

1. Check for /vendor/autoload.php
   
2. Check the read permissions of the autoload file
   
3. If the script that includes autoload is not located next to the vendor directory, write the absolute path to the file