On the web browser of your choice visit https://www.citrix.com/downloads/workspace-app/windows/workspace-app-for-windows-latest.html and it will show you this screen.
Visit: https://www.citrix.com/downloads/workspace-app/mac/workspace-app-for-mac-latest.html to download the macOS version.
Click on the "download Citrix Workspace app for Windows/Mac" (the icon will be in the same location) to continue. Run the installation to continue. (must need admin prompt to complete)
Bonus (no admin access, no problem):
Visit https://100299.campusnexus.cloud/logon/LogonPoint/index.html and sign in.
It will prompt you to check for a Citrix receiver client on your computer, by clicking on "Detect Receiver". If it has not been already installed an installation for Citrix receiver will be installed without the admin prompt.