Disk write error: not enough space
First confirm that you do, in fact, have enough space on the disk that you're trying to write to.
If you are on Windows, is your hard disk drive formatted to NTFS or FAT32 partition? What is the size of the file you are currently downloading? There is a 4GB file size limitation on FAT32 file systems, so files can only be written if they are less than 4GB. What OS are you using? Make sure that your hard drive is on NTFS. If it is formatted to FAT32, you can convert it with the convert command:
convert c: /FS:NTFS
(replace c: with the drive letter if it is a different drive)
Read more info on FAT 32 from here: FAT32 file size limit