Be sure to have a working OpenCart 2 installation before you attempt to install the theme. Also, Pavilion is not compatible with OpenCart 188.8.131.52 (the first released version from the 2.x branch). You should have OpenCart 184.108.40.206 at least.
1Copy theme files
Unzip the “pavilion-premium-responsive-open-cart-theme.zip” archive you have downloaded from ThemeForest.net. Enter the OpenCart_v.2.0.x folder. Upload all the files to the directory you have installed OpenCart in:
In OpenCart admin panel go to System › Settings › Store Edit › Store › Template dropdown and choose Pavilion
3Theme module installation
In OpenCart admin panel go to Extensions › Modules and install Pavilion CP module.
It you are using pavilion theme for the first time you may check the First Steps section in order to find out how to install some sample data or adjust the theme settings to your needs.