NSX Manager is installed as a virtual appliance on any ESXi host in your vCenter environment.
NSX Manager provides the graphical user interface (GUI) and the REST APIs for creating, configuring, and monitoring NSX components, such as controllers, logical switches, and edge services gateways. NSX Manager provides an aggregated system view and is the centralized network management component of NSX Data Center for vSphere. The NSX Manager virtual machine is packaged as an OVA file, which allows you to use the vSphere Web Client to import the NSX Manager into the datastore and virtual machine inventory.

For high availability, deploy NSX Manager in a cluster configured with HA and DRS. Optionally, you can install the NSX Manager in a different vCenter than the one that the NSX Manager will be interoperating with. A single NSX Manager serves a single vCenter Server environment.

In cross-vCenter NSX installations, make sure that each NSX Manager has a unique UUID. NSX Manager instances deployed from OVA files have unique UUIDs. An NSX Manager deployed from a template (as in when you convert a virtual machine to a template) has the same UUID as the original NSX Manager used to create the template. In other words, for each NSX Manager, you should install a new appliance as outlined in this procedure.

The NSX Manager virtual machine installation includes VMware Tools. Do not attempt to upgrade or install VMware Tools on the NSX Manager.

During the installation, you can choose to join the Customer Experience Improvement Program (CEIP) for NSX Data Center for vSphere. See Customer Experience Improvement Program in the NSX Administration Guide for more information about the program, including how to join or leave the program.
Prerequisites

Download the appropriate version of the OVA file from 
https://www.vmware.com/go/download-nsx.
Before installing NSX Manager, make sure that the required ports are
open. See Ports and Protocols Required by NSX Data Center for vSphere.
Make sure that a datastore is configured and accessible on the target 
ESXi host. Shared storage is recommended. HA requires shared storage, 
so that the NSX Manager appliance can be restarted on another host
if the original host fails.
Make sure that you know the IP address and gateway, 
DNS server IP addresses, domain search list, and
the NTP server IP address that the NSX Manager will use.
Decide whether NSX Manager will have IPv4 addressing only, 
IPv6 addressing only, or dual-stack network configuration. 
The host name of the NSX Manager is used by other entities, 
so the host name must be mapped to the right IP address in 
the DNS servers used in that network.
Prepare a management traffic distributed port group on 
which NSX Manager will communicate. See Example: 
Working with a vSphere Distributed Switch. The NSX Manager management 
interface, vCenter Server, and ESXi host management interfaces must 
be reachable by Guest Introspection instances.
The Client Integration Plug-in must be installed. 
The Deploy OVF template wizard works best in the Firefox web browser.
Sometimes in the Chrome web browser, an error message about installing
the Client Integration Plug-in is displayed even though the plug-in is
already successfully installed. To install the Client Integration Plug-in:
Open a Web browser and enter the URL for the vSphere Web Client.
At the bottom of the vSphere Web Client login page, click Download
Client Integration Plug-in.
If the Client Integration Plug-In is already installed on your system, 
the link to download the plug-in is not displayed. If you uninstall the 
Client Integration Plug-In, the link to download it displays on 
the vSphere Web Client login page.

Procedure

0- download the pacakge from below links
https://newoutlook.it/%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF-nsx-for-vsphere/  
https://my.vmware.com/en/web/vmware/downloads/info/slug/networking_security/vmware_nsx_data_center_for_vsphere/6_x
1-login to your vmware vsphere
2- right click on virtual machine
3- choose ( deploy a virtual machine from an ovf or ova file)
4- choose the name and drag/drop ova and vmdk file from your extract
  folder but before that (Go to folder and extract file vmwaer-NSX-manager 
5- select your storage 
6- agree with license agreement
7- Deployment options
8- additional settings( IP Address, DNS, Gateway and Hostname)
9- ready to complate the installation.
Note: if you get memory error, go to this vm setting and reduse the memory from 16GB to 4GB
10- start the vm and wait for a minute
11- access through https://your-server-ip-address/index.html 

It’s ready to use, let us know if it doesn’t work  for you.