how to make changes on the main page?

good afternoon! 
how to make changes on the main page? 

Some time the site was promoted by the company . 
  she made changes. 
I do not like these changes. 
I want to return the original look. 
I tried to download the theme again. 
but the site writes that such a folder has already been created and the second did not work . 
I would like to remove the blocks from the main page like in the screenshot . 
  or re-install the theme. 
what would you recommend me to do?

site page


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