Hello atillakilic, thats right, you need to purchase professional or premium edition to get MegaSearch.
Smartstore Professional Edition
In which case is the Professional Edition interesting for you and what services and advantages can you expect? This edition is only important, if you want to run a full-fledged online shop using the included plugins. In other words, if you are ready and considering to invest, you are definitely ready to get into e-commerce professionally. So what can you expect from the Professional Edition?
For example the Mega Search Plugin, which is able to deliver results of millions of products and variants, product groups and manufacturers in milliseconds. Or the Mega Menu, which allows you to flexibly set up the main navigation structure of the product catalogue. Not to be neglected, the Content Slider, this offers an unmissable presentation possibility for products and by the use of own HTML code, for every imaginable content on the start page and in all product groups and much more. More about the advantages of the Professional Edition can be found here.
More about MegaSearch here: https://smartstore.c.../tag/megasearch