Please find This Tutorial for updating Theme Versions: https://d5creation.com/themeupdate
Log in to the WordPress Administration Panel.
Select the Appearance panel, then Themes.
Activate another Theme present in the list, then Delete the Theme Small Business Extend You want to Update.
Select Install Themes
Use the Upload link in the top sub-menu to upload a zipped copy of a Theme that you have previously downloaded to your machine.
Click Choose File to locate a Theme you would like to use.
Click Install Now
Activate Small Business Extend Theme