How to install themes or templates in opencart
If you have already a theme/template that you bought from any websites that provide themes for OpenCart…follow the steps:
1) Upload the theme
Unzipt the file and copy the files in the catalog/view/theme folders of your website.
2) Activate the theme
If your theme was uploaded with success in the opencart theme folder, go to System->Settings , click on the editbutton.
Click on the Store tab and select from the Template dropdown your new installed theme.