fomat your usb to FAT32 or else you will get a file mismatch
1.Unzip AJ's List XX-XX-XX.zip with a program such as winrar & place the TP_PROG.DBS file onto the root of your USB drive.
2.In the Openbox menu delete your current channel list by going to the "Edit Channel" tab & selecting "Delete All".
3.Staying in the menu navigate to the "Tools" tab then "Upgrade by USB", change the upgrade mode from "Image File" to "Misc Files" then "Select & Upgrade" & select "TP_PROG.DBS" then press yellow, if all done correctly it should begin to upgrade.
4.Once the upgrade has completed restart your box & voilá!
also try downloading the file through a different browser like firefox, chrome. internet explore is not 100% reliable.