are you using pRO client?
on the server side.
make sure you include this packet in your packetdb.
//2012-04-10aRagexe
// New cashshop
0x0844,2,cashshopopen,0
0x084a,2,cashshopclose,0
0x08c9,4,cashshopitemlist,0
0x0848,-1,cashshopbuy,0
i'm used your download file part2 on first page.
and for packetdb, already have in there, because i'm always up to date my rathena to lastest version