At first, please make sure your system meets the following requirements
Go to Themeforest.net > Your Download page. Please download the package from your download page
To install the theme correctly, after downloading the theme package from Themeforest, you need to Unzip the package. There are folders inside.
Appearances--> Themes
alita.zip
in Theme folder and click Install Now.alita.zip
in theme folder of theme package./wp-content / themes/
Appearances --> Themes
> and activate it.