Once you purchase Crane theme on ThemeForest you can download it. Please note there are two archive variants. The first one is product archive containing documentation, bundled files, archive with Crane theme, and some additional files. The second archive is Crane theme, ready for installation in WordPress.
To download the theme:
Step 1 -- Login at ThemeForest and go to “Downloads” section. Find the purchased Crane theme there.
Step 2 -- Press "Download" button and select “Installable WordPress file only” which will contain the archive of Crane template. You should receive and save crane.zip file on your computer.