[Ajax] Best Answer not work on 4.2.5

[S!p]

Hello,
i`m trying to install https://vborg.vbsupport.ru/showthread.php?t=322478 on 4.2.5
The button is visable in showthread, but after press on it, nothing happend.

My browser is showing error: Uncaught ReferenceError: jQuery is not defined
at bestAnswer.js:43:4

(function ($, window) {
    var $btn;
    var postId;
    var threadid = ($("input[name='threadid']")[0] || $("input[name='searchthreadid']")[0]).value;
    var baseUrl = window.getBaseUrl() + 'bestAnswer.php';
    
    var onSelectSuccess = function () {
        $bestAnswerContainer = $btn.closest('.bestAnswer_container');
        $('.selectBestAnswer').hide();
        $bestAnswerContainer
            .find('.unselectBestAnswer')
            .show();        

    }
    
    var onUnselectSuccess = function () {
        $bestAnswerContainer = $btn.closest('.bestAnswer_container');
        $('.selectBestAnswer').show();
        $('.unselectBestAnswer').hide();
    }    
    
    
    window.onSelectBestAnswer = function (postid, btn) {
        $btn = $(btn);
        postId = postid;
        $.ajax({
            url: baseUrl + '?do=selectBestAnswer&postid=' + postid + '&threadid=' + threadid,
            success: onSelectSuccess
        });
    }
    
    window.onUnselectBestAnswer = function (postid, btn) {
        $btn = $(btn);
        postId = postid;
        $.ajax({
            url: baseUrl + '?do=unselectBestAnswer&postid=' + postid + '&threadid=' + threadid,
            success: onUnselectSuccess
        });
    }
    	var script = document.createElement('script');
	script.src = 'https://code.jquery.com/jquery-3.6.3.min.js';
	document.getElementsByTagName('head')[0].appendChild(script);
})(jQuery, window)

Line 43: in .js file: (jQuery, window)
How can I fix it?