In the default software, you can do that in the admin panel here: www.yoursite.com/admin/settings/user in the Registration section: Avatar upload: set to Display. 

Users reported a bug two years ago that this functional does not work, we have fixed it and now it appears again. 

We have passed it to our developer again, I'll provide you with fix or workaround asap. 

I found a setting for that in ACP should I still use this patch?

What is ACP?

"Admin Control Panel" I mean there is a setting that says hide show and make required! Do I need to still this path?

Marcus if you want avatar to be not required, just set it to "display"

It's not correct, add the breaks on switch:

    protected function addLastStepQuestions($controller) {
       
        $displayPhoto = false;
        $displayPhotoUpload = OW::getConfig()->getValue('base', 'join_display_photo_upload');
        $avatarValidator = OW::getClassInstance("BASE_CLASS_AvatarFieldValidator", false);
       
        switch ($displayPhotoUpload) {
           
            case BOL_UserService::CONFIG_JOIN_DISPLAY_AND_SET_REQUIRED_PHOTO_UPLOAD:
                    $avatarValidator = OW::getClassInstance("BASE_CLASS_AvatarFieldValidator", true);
                    $userPhoto = OW::getClassInstance("BASE_CLASS_JoinUploadPhotoField", 'userPhoto');
                    $userPhoto->setLabel(OW::getLanguage()->text('base', 'questions_question_user_photo_label'));
                    $userPhoto->addValidator($avatarValidator);
                   
                    $this->addElement($userPhoto);
                    $displayPhoto = true;
                    break;
           
            case BOL_UserService::CONFIG_JOIN_DISPLAY_PHOTO_UPLOAD:
                    $userPhoto = OW::getClassInstance("BASE_CLASS_JoinUploadPhotoField", 'userPhoto');
                    $userPhoto->setLabel(OW::getLanguage()->text('base', 'questions_question_user_photo_label'));
                    $userPhoto->addValidator($avatarValidator);
                   
                    $this->addElement($userPhoto);
                    $displayPhoto = true;
                    break;
        }

        .......

this is the way to make work fine the 3 options on admin panel.

Cheers,
Musi.