See if you have downloaded in the PC then I would recommend you to check the downloads folder. If its not present there then you should check your email in the Inbox/All mail section. If not find then you can visit the spam folder also. You can find it there. Now if you have downloaded in phone then I would recommend you to check both the internal and external storage folder in the documents or the downloads section. I am sure you will get in any of the way.

I hope this answer helps. All the very best for your future endeavors!