If your users are running Citrix Receiver for Mac 12 on OS X El Capitan and are having trouble connecting, they may need to upgrade their NetScaler Gateway plugin. For more information, see this article on the Citrix downloads page: NetScaler Gateway Plug-in v3.1.4 for Mac OS X (El Capitan Support). Citrix Workspace app for Mac is compatible with all currently supported versions of the following Citrix products. For information about the Citrix product lifecycle, and to find out when Citrix stops supporting specific versions of products, see the Citrix Product Lifecycle Matrix.
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- Receiver
Objective
How to uninstall Mac receiver to make sure all the related directories are removed.
Instructions

Citrix Workspace Mac Os X Catalina
You can uninstall Citrix Workspace app for Mac manually by opening the .dmg file. Select Uninstall Citrix Workspace App and follow the on-screen instructions. The .dmg file is the file that is downloaded from Citrix when installing Citrix Workspace app for Mac for the first time. If the file is no longer on your computer, download the file again from Citrix Downloads to uninstall the application.
Files related to Citrix Workspace App are present in '/Applications/Citrix Workspace.app' and '/Library/Application Support/Citrix Receiver'. After uninstallation process If any files are present in the above mentioned paths you can delete them from Finder App.
Files related to Citrix Workspace App are present in '/Applications/Citrix Workspace.app' and '/Library/Application Support/Citrix Receiver'. After uninstallation process If any files are present in the above mentioned paths you can delete them from Finder App.
Citrix Workspace Update Mac
Additional Resources

Citrix Workspace For Mac Os X El Capitan
https://docs.citrix.com/en-us/citrix-workspace-app-for-mac/install-uninstall.html#uninstall
