You should just be able to select "Keep" in that popup, and then you'll have the file. (Of course, this might depend on how long ago it was and whether you or it have done anything with the temporary file since...)
But in the context of this conversation, it sounds like you might be barking up the wrong tree. Your hub database backups do not include the platform version. You would need to use the Diagnostic Tool to revert to a previous version, as noted in the Settings > Backup and Restore page you probably used to get here. If restoring a regular hub backup helped with your problem, I suspect it related to one of the other solutions above (such as a full refresh of the page, or enabling one of the options).
