There are several ways to download your purchased product. If you ordered as a GUEST, you should check your emails. 
In some cases they may have ended up in spam or advertising folders.
In your order email you will find a download link. Just click on it and download the product?? 

If you ordered with an own3d Account. If you created an account when placing your order, you will find the download area here. 

You can access all downloads here at any time and download them an unlimited amount of times. Alternatively, you can also use the download link, which you received by email.