I don't know how long they let you download it but have you checked your purchases? It should be listed in your online account.
How to download your purchase
https://ttlc.intuit.com/community/installing/help/how-do-i-download-the-software-i-purchased-at-turb...
Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
Can't find your purchase?
https://ttlc.intuit.com/questions/2565823-why-can-t-i-find-my-purchase-after-signing-in-to-my-downlo...
