what do you mean, chd files come in one?You need all those downloads.
roms/area51/area51.chd
roms/area51mx/area51mx.chd
roms/biofreak/biofreak.chd
roms/blitz/blitz.chd
roms/blitz2k/blitz2k.chd
roms/blitz99/blitz99.chd
roms/bm1stmix/753jaa11.chd
roms/bm2ndmix/853jaa11.chd
roms/bm4thmix/847jaa11.chd
roms/bmcompmx/858jaa11.chd
roms/bmcorerm/a05jaa11.chd
roms/bmdct/995jaa11.chd
roms/calspeed/calspeed.chd
roms/carnevil/carnevil.chd
roms/cryptklr/ckiller.chd
roms/hmcompm2/988jaa11.chd
roms/jdredd/jdreddc.chd
roms/jdreddb/jdreddb.chd
roms/kinst/kinst.chd
roms/kinst2/kinst2.chd
roms/mace/mace.chd
roms/maxforce/maxforce.chd
roms/primrag2/primrag2.chd
roms/sfrush/sfrush.chd
roms/vcircle/vcircle.chd
roms/wargods/wargods.chd
roms/wg3dh/wg3dh.chd