You could switch to Linux, that is what I did years ago.
If the file system on the directory where you download to is FAT or some other FS which can not handle huge files, that could be the reason. Maybe get a USB memory stick, format it with NTFS and try downloading to that? But you still would not be able to install the game on your computer disk, because the game extracted from the .zip has two files larger than 2 GB.
Other ways to solving the problem:
- if you used WIFI, connect with Ethernet cable to router instead. If the problem was WIFI glitch, this should help.
- Try downloading to another device. Maybe your phone or tablet has 13 GB free?
- If you have portable computer, visit neigbour or buddy and do the download there
- What devices are between your computer and Internet? Examine if they have missing firmware updates, or see if you can bypass them and connect to Internet more directly.