Check your email for your purchase receipt. You will see the download links here, under the Title of the product you purchased. You must be logged into your BudgetVFX account in order to download.
Another option is going directly to your BudgetVFX account (http://budgetvfx.com/my-account). In your account you will see a list of your Available Downloads and you can also look at your orders and print invoices here as well.
Depending on your internet browser, when you click on your link it will either begin downloading immediately or you will need to choose a location to save the zip file. After you choose the location, your files will begin downloading.
Start playing with your new elements. Remember, these files are not plugins. They are .mov files and you will import them into your editor/compositor of choice the same way you import any video footage. Once imported, you can drag the elements on top of your original video and by changing the blend/overlay mode, experience the awesome elements that make up BudgetVFX!