Yes, do what rebel1916 has suggested. Make sure your usb has been formatted to FAT32 first. Then extract your file as an .ipk file is usually in .zip format.Reboot the box also format the usb stick and put the file back on it and try again.
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Sorry I can't help you with a vu +duo box. Had no experience of one before. Hopefully, someone will be able to assist you.Still won't work ! It installed no bother on zgemma via USB with dream explorer but keeps giving error on vu +duo ! Iv used FileZilla and checked folders on box and it's not installed.
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http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html