In order to install the Ped's, you need OPEN IV. (https://openiv.com/)
Once  OPEN IV is open, create a folder named MODS (if not existing)
Mod files should be added in path:
MODS>UPDATE>x64>DLCPACKS>ADDONPEDS>DLC.RPF>PEDS.RPF
addonpeds (Ped Selector) should also be added under the "DLCLIST.XML" File:
OPENIV>GTAV>MODS>UPDATE>UPDATE.RPF>COMMON>DATA>DLCLIST.XML
Add the following Line in the "DLCLIST.XML" File:
<Item>dlcpacks:/addonpeds/</Item>
Now Download Pedselector for your GTA V 
Download Link to Pedselector:
https://www.gta5-mods.com/scripts/addonpeds-asi-pedselector
Press L in-game to open the Ped Selector Menu.
Select the Ped's by their Names...
DONE. 

Enjoy <3