That file, being over 5GB, is likely to be hitting some server side limits.
It could be taking too long, so that would be max_execution_time. It could be too large for the server to receive, so that would be upload_max_filesize and post_max_size.
There's likely other limits too. Aside from anything, is it even legal to redistribute that file? Being that it looks like it's a Windows 10 ISO. (I appreciate it's probably available as a free download in some circumstances, but that doesn't necessarily mean it's legal for you to redistribute it).
This comes up straight off when you select the file but possibly it is because it is larger than normal, I actually will need to check my server setting to see what I have set the max file size to.
The legality of having it for download should not be an issue as this is an internal (Private) site and we looking at doing mass upgrades of fully legal Windows 7 installation, as far as I understand this is the idea behind being able to download it in the first place Windows 10