Vmware tools is part of the O.S however the image you downloaded is a GA version , VMware has suffered several updates since that time, same API Gateway G10 version.
to update Vmware tools
1- Login to your virtualization environment using the VSphere client.
2- Right click the Virtual Machine in the Inventory Pane.
3- Select the "Guest" sub-menu option.
4- Select the "Install/Upgrade VMware Tools" option.
5- Select "Interactive" when prompted.
6- Access the virtual console and log in as root.
7- Mount the virtual CD-ROM via `mount /dev/cdrom /media`.
8- Extract the VMware Tools installer via `tar xvf /media/*gz -C /tmp`
9- Run the installer script via `perl /tmp/vmware-tools-distrib/vmware-install.pl`
10- Accept all default values.
11- Restart VM Once complete, you should be upgraded in accordance with the version of VMware Tools used by your ESX platform.
12- Official VMWare KB that these commands were sourced from is below:
for API Gateway version 10 , please check the latest patches availables