Update from cpg 1.5.48 –> 1.6.26 stops at the step 4

[zeppo]

Hello Friends,

I try to update my site to work with PHP 8.1, and tried to update cpg 1.5.48 –> 1.6.26, but the istallation stops at the step 4:
___________________________________

"$install_config = array(

      'lang' => 'finnish',

    'steps_done' => array(

          '0' => '1',

          '1' => '2',

          '2' => '3',

          '3' => '4',

    ),

      'step' => '4',

      'javascript_test_passed' => '1',

);

___________________________________

What could be the problem?

[zeppo]

Error code: "500 Internal Server Error"