Hl2 ep1 and ep2 npcs missing

Hi, I’ve had garrys mod for a long time now and during that time I’ve acquired games like HL2, EP1, EP2, portal, etc.

I thought everything was supposed to be there if you had the game? My issue is that, NPC’s like the strider or the combine with red eyes, do not appear in the NPC spawn menu. I checked the garrysmod options and made sure that those games were checked.
Please help me i was really looking forward to having these npcs.