Hi LeonidS, here is the content of  install/installer.php  of mymodule

I took Spaces as my initial module 

/**

 * Copyright (c) UNA, Inc - https://una.io

 * MIT License - https://opensource.org/licenses/MIT

 *

 * @defdroup    Spaces Spaces

 * @indroup     UnaModules

 *

 * @{

 */

class BxSpacesInstaller extends BxBaseModProfileInstaller

{

    function __construct($aConfig)

    {

        parent::__construct($aConfig);

    }

}

/** @} */