Ticketlab is a 100% end-2-end WordPress ticketing theme. In order to successfully install activate and run the theme on your domain you don’t need anything except for what is already included for free within the theme’s package. This is not a complementary theme, it’s a product that will allow you to create a standalone ticket system.
It does not need Zendesk nor any other plugin to work as a ticketing system, and you will not need a subscription to any other system in order to make this work successfully.
That being said we do offer you the option of creating a sync between TicketLab and your Zendesk account if you choose to do so.