Citrix Workspace App fail to upgrade with an error 0x800951C2 when upgrading Server VDA from 1912 CU4 to 2203 CU2.

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Install Microsoft Edge WebView2(version 92 or later) manually before updating VDA and CWA.
Microsoft Edge WebView2 can be download from https://developer.microsoft.com/en-us/microsoft-edge/webview2/#download-section

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Problem Cause

Citrix Workspace App will download and install the latest Edge WebView2 runtime during its installation.
The VDA cannot download the instllataion media from internet.