Well, thank you for your response but I still think that you might check the quickstart package. As I previously said, the Joomla CMS is identifying K2 as an improperly installed component via Extensions/Manage/Discover option and also folders on Joomla installation which are belonging to K2 component (Example: administrator/components/com_k2 ). I think it would be better to avoid having unused folders and/or files on a production website, especially on an online shop.
Please don't get me wrong, I really appreciate your work and designs but I just want to be sure that everything is properly installed and running.
Thank you again for your support.