I suppose that you have a support contract. In that case, you also have access to the download repository of the NetWorker software. Here you will also find the vProxy software package - it is among the about 17or 18 listed software packages for a NW version. Just download and install it.  
--I have set up Networker in our VMware demo environment（VSphere Client 6.5.） using  the vProxy OVF. Now, I need set up NW in VMware environment of vSphere Client 6.7.But I don't  have the vProxy OVF.   -NW 18.2.0.1 -My boss don't want to update the VMware environment. --Can you tell me  a download URL , or send mail  to me. That's all ,thank you very much.
Download the NW vProxy OVF