You can download a trial of the NetScaler virtual appliance from Citrix here: https://secureportal.citrix.com/MyCitrix/login/EvalLand.aspx?downloadid=1857216&LandingFrom=1005.

You should also have a virtual environment running any one of VMware, Citrix XenServer, or Hyper-V. If you do not have a virtual environment, you can test it on a client hypervisor.

For instance, if you are using Windows 8.1/10, you can use Client Hyper-V, which is an add-on that needs to be added from Programs and features under Control Panel.

Alternatively, you can use VMware Player (https://my.vmware.com/web/vmware/free#desktop_end_user_computing/vmware_player/6_0).