It appears most likely to be an issue with network security preventing the downloads, for there were 2 updates able to download per your screen shot, and I presume the others are restricted executable types.
Please review KM: TECH186657 for additional assistance with how to allow for the needed download locations to pass through network security. Also review KM: HOWTO5496, for it also details updates failing download due to this type of restriction.
Although, the actual errors in the logs may differ from these troubleshooting steps, so follow Alex's directions first, for that will be the start point of isolating the cause for download failure.
Let us know if you have any questions regarding the Log Viewer and we will be happy to help.