Hope you are trying to install this Shopify theme in the WordPress site, This theme is compatible with Shopify ecommerce platform only. You must have Shopify store before using this theme.

Or if you are getting error as follows…

There is 1 error:
zip does not contain a valid theme: missing template "layout/theme.liquid", missing template "templates/index.liquid", missing template "templates/collection.liquid", missing template "templates/product.liquid", missing template "templates/page.liquid", missing template "templates/cart.liquid", and missing template "templates/blog.liquid"

Please unpack the whole package after downloading it from Themeforest. On that extracted Theme-Package-Name-V1, You can find things like Documentation,ThemeName.zip, Log.txt, and Readme.txt. You need to install the file “ThemeName.zip”.