how to install Porto theme

i bought the porto package and its a large zip file , how do i install a particular theme?
the ones i see on the porto site for example


Assuming you have bought the WordPress version of the theme then follow instructions here

Bear in mind that the theme will not look like the demo until you install the demo content and that images used may not be included.

Check the theme documentation to see how to install the demo content

i was able to install the theme by importing the file and then select store-4 as template.