Some people are having issues so i'll try and go through the process as simply as possible.

Confirmed working 41.65

To play solo with cheat menu:

1/ Subscribe to this mod in the workshop

2/ Open Project Zomboid (close and re-open if you have it open already)

3/ Click on SOLO

4/ At the bottom of the NEW GAME window, under MODS, click "Choose Mods"

5/ Click "Cheat Menu" so it says ENABLED.

6/ Select your Playstyle and hit next.

7/ Once in game, right click anywhere on the ground to view the cheat menu.

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To HOST with cheat menu:

1/ Subscribe to this mod in the workshop

2/ Navigate to the Zomboid workshop mods folder for steam. For example, my directory is;
C:\Program Files (x86)\Steam\steamapps\workshop\content\108600\499795221\mods

3/ Copy the folder named "Cheat Menu"

4/ Navigate to the Zomboid mods folder in your Windows User folder. For example, my directory is;
C:\Users\reeeeedly\Zomboid\mods

(If there is no Zomboid folder in your User folder, host a server and then close Zomboid to create the folder.)

5/ Paste the "Cheat Menu" folder.

6/ Open Project Zomboid and click HOST

7/ Click Manage Settings...

8/ Click Edit Selected Settings

9/ In the left Menu, click Mods

10/ Under "Add an installed mod to the list:" click "Cheat Menu". This should add the mod "Cheat Menu" to the "Mods used by this server" list.

11/ Click Save and Back

12/ Start server. Right click anywhere on the ground to view Cheat Menu.

13/ If you want others to be able to use cheat menu on your hosted server, they must also have installed the Cheat Menu mod into their User/Zomboid/mods folder. They must also be an admin on the server. To do this, type /grantadmin THEIRNAME.