Alright the Michelle IIA agent retexture is a replacement for the fbi ped heres how to install.
1:you need to download open iv.
2:open the program open iv.
3:give open iv your game installation location.
4:in open iv go to pc>models>componentpeds.
5:search for m_m_fbi in open iv 
6:backup all 3 m_m_fbi files (better yet back up your game) click extract then move those 3 files to the folder you created.
7:replace those m_m_fbi files in componentpeds with ones included with the mod.
8:launch the game and see if the model appears and the game works.
9lasty enjoy the mod.        