Im not too familiar with sizmek exports, however your free to do some research on the forum and perhaps @Daniel or @jonathan could step in and help you out from here. I just know the process of installing an export script. Also, at times Sizmek and Google... tweak the submit guidelines in terms of whats included in the export so yeah its a bit of tricky thing to get it up and running.
heres what I found by searching sizmek.