You find the revised rules here.
I changed the setup a little, to make it a little easier:
I prepare the item deck following the designers suggestion to take 6 cards of every colour and remove the rest. This makes it more likely to gain different coloured items.
I use only 2 x 5 zombie markers and 1 x 6 zombie marker.
In addition I draw from a cup 4 “zombie with special abilities” markers and mix them with the others.
If one of the special zombie markers shows up, their number is only 1 D4. If the last of the special zombies is killed, the player who killed it may gain an item from the search deck.