You might try adding that repository that @Aravisian posted, then install the plugin.
that was first thing yeah. And After that I dont have xfce 4.16 , it is 4.14..hm
When you add a repository, what that does is changes where 'apt install' gets its stuff from.
ex.
apt install xfce4-zorinmenulite-plugin
You got:
E: Unable to locate package xfce4-zorinmenulite-plugin
Then you run this command (this might not be the actual command):
sudo add-apt-repository ppa:xubuntu-dev/staging
Now if you run:
apt install xfce4-zorinmenulite-plugin
It works because its getting the plugin from a different location. In summary, your still on 4.14 because you 'apt install xfce4' BEFORE you added the repository. Now that you have the repository, you would have to reinstall xfce4. Actually.. now that you have the repository... you might just have to do an update and thats it.
apt-get update -y && apt-get upgrade -y
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After adding the Repo, you must then run:
sudo apt update && sudo apt full-upgrade
This should then install xfce 4.16 on the system. If xfce is not yet installed, running sudo apt install xfce4 should then install xfce 4.16.
The zorinmenulite plugin is found within the Zorin OS repository so it should show up just fine if you are using Zorin OS which comes with the Zorin OS repository already added in your sources.
We disagree. 
But if you prefer gdm3, you can switch back to it, no problem
sudo apt install gdm3
Then follow the configuration prompts in the same way you did for configuring lightdm.
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No. I am still using Zorin OS 16 BETA and I had installed xfce4 4.16 (I prefer 4.14... but needed to use 4.16 for testing) on it first thing after installing the Beta.
It has been running like a champ.
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In my case , ram usage on Zorin Gnome is almost the same as with xfce.
What about cinnamon , didn't tried that on Zorin , maybe it is lighter ?
Hi, what repository do I need to be able to install zorin-os-desktop-lite on xfce? Thank you!
In my experience, Cinnamon has been lighter than Gnome but heavier than XFCE.
Zorin with Gnome tends to run faster and lighter then Ubuntu with Gnome.
The repository is already included in Zorin OS. If you are running Zorin OS 16, then Lite has not yet been released and the package is not yet available.
sudo add-apt-repository ppa:zorin-os/packages
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I really want to switch to xfce, but don't want to lose beautiful gnome setup and those layouts..
Why layouts doesn't work in xfce ? 
XFCE uses a Window Manager. Gnome dropped support for full window managers in favor of csd, which dumps support and development for window managers onto... everyone else.
But you can set up any layout you want on XFCE. The Zorin Layouts you see can be chosen from an app. On XFCE, you would need to just position them manually.
Yes, I know , on linux you can do whatever you want, but more work. hehe
With layouts it is just one click.
Before Zorin I even used WM ( bspwm) and that was fun. Maybe best way how to learn linux. But it is pain in the backside xD
If you are willing, I can help you do all the painful work in exploring the settings, configurations and options in your XFCE system.
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Great, thank you. When I switch to XFCE I will ask for your support.
Atm I am satisfied with Gnome. No issues at all and everything is smooth.
But maybe, I can start to play with bspwm 
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@Aravisian Hi again, just a double-check with you: Once I install the xfce4 desktop, I will still be able to switch back and forth between Gnome and xfce4, correct?
Yep. Log out and select which desktop you wish to log into and log in.
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Thanks!!!
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I must not have understood your command line for adding the repository:
Can you tell me what I did wrong? I did click on the link in your post above "Index of /xubuntu-dev/staging/ubuntu" but it would not open for me.
@Aravisian I think I see the error of my ways. Maybe you can ignore my request and help some others.
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Hello @Aravisian,
It's me, the newbie. I did everything above on OS 16. But couldn't get 4.16 installed. Just kept saying 4.14 is installed. Plugin also not available no matter how many times I redid all the steps.
I rebooted and noticed Zorin Desktop, XFCE Session, Zorin on Wayland are available now. What are the difference between the two Zorin ones?
Also how do I get rid of all the changes and revert back to stock OS16 desktop now? I personally am not a fan of the XFCE look.
Thanks!