Turnitin does not allow you to download individual files from an anonymous assignment so you have to down the files using the Bulk download technique.
For anonymous assignments the files are named with the paper ID.
To bulk download files
1 Go to the assignment inbox and select the files you wish to download.
2 Select the files to download
3 A yellow bar will appear click on the download drop box
4 Select download original file. This will zip all the files and send the zip files to you in a message
5 Go to your messages. The new message will be at the top of the list
6 Click on the new message to open it
7 click on the link to download the Zip file
8 open the downloaded Zip file
Student papers will be names by the paper ID and the paper title