Nintex Workflow and Forms require activation of web applications that will use the product.
To activate Nintex Workflow the web applications
On the Central Administration Home page, click Nintex Workflow Management
Click Web Application activation.
The default web application name is automatically selected.
To activate all web applications for Nintex Workflow, select the check box for All content web applications and then click Activate.
To activate a subset of web applications for Nintex Workflow, select each web application and then click Activate; repeat until all desired web applications have been activated.
To activate Nintex Forms on a web application
On the SharePoint Central Administration Home page, click Application Management.
In the Web Applications section, click Manage web applications.
In the Name column, select the web application on which you want to activate Nintex Forms.
For example, select SharePoint -80.
In the Web Applications ribbon, click Manage Features.
The Manage Web Application Features dialog box appears.
In the Nintex Forms section, click Activate.
After a short delay, the dialog box refreshes and the status is "Active."
Click OK.