After upgrading macOS to Catalina 10.15.4, a dialog box will prompt the end user with the following message: 

• Existing software on your system loaded a system extension signed by "Citrix Systems, Inc." which will be incompatible with a future version of macOS. Contact the developer for support. 

Please note this is an example of the dialog box; "DEVELOPER_NAME" would be Citrix Systems, Inc. instead.: 

The engineering team is currently evaluating solutions. 

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Problem Cause

USB Generic redirection is the main component utilizing kernel extensions. Apple is deprecating the use of Kernel extensions in upcoming releases of macOS. 

The warning is to inform us before moving forward with the deprecation.

In the event Apple deprecates it in the next release, only Generic USB redirection will be affected, and will not allow the use of said feature. 

https://support.apple.com/en-us/HT210999