Modern OpenCart theme. Easy to install and use.

Prerequisites
[Opencart 3.x]
Backup of your store, in order to avoid data loss in case something goes wrong

Installation

Download the theme, and unzip it

Upload the contents inside of the "upload" folder

Sign into OpenCart with the Administrator account

Expand the Extensions menu, and select the Extension option

Using the module filter, select the Themes option to load all themes installed

Find the Sellr Theme, and click on the Install button. After installing the theme, edit its setting and activate it

Expand the System menu, and select the Settings option

Find the store that you want to modify, and click on the Edit button

In the General tab, locate the Theme section and select the Sellr Theme

Save your changes.

Go to the OpenCart Dashboard, and Refresh the Theme and SASS cache