for backup, go to this link
"https://ia600509.us.archive.org/view_archive.php?archive=/5/items/grand-theft-auto-iv-vanilla-back-up/Grand%20Theft%20Auto%20IV%20vanilla%20back%20up.zip"

and download most of the following.
Grand Theft Auto IV vanilla back up/GTAIV/TLAD/pc/models/cdimages/componentpeds.img (for M_Y_PrisonBlack_01 models)
Grand Theft Auto IV vanilla back up/GTAIV/TLAD/common/data/pedVariations.dat
Grand Theft Auto IV vanilla back up/GTAIV/TLAD/common/data/pedpersonality.dat
Grand Theft Auto IV vanilla back up/GTAIV/TLAD/common/data/peds.ide