If you have purchased the Social Media Kit add-on, there are several ways to download your assets.
Immediately after purchasing your logo package, you will see this page, and you can download your Social Media Kit by clicking the Download button under its heading.
If you navigated away from this page, or you've updated your logo files, you can also download them by clicking on your purchased logo on your Saved logos page and then navigating to your Social Media Kit and clicking Download, under Your Brand Assets. Your Social Media Kit will be included in the download file for the rest of your logo assets.
*Note: The Social Media kit is package add-on, meaning there it is an additional purchase on top of your logo package, and is not included in the Premium package.