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You receive an "Error 80070643" error message when you try to install Microsoft Application Virtualization (App-V) 4.5 SP2 on the Microsoft Application Virtualization Client via Microsoft Update.
Install Microsoft Application Error Reporting before installing the Microsoft Application Virtualization 4.5 SP2 update.
When installing Microsoft Application Error Reporting, you must use the APPGUID parameter to specify the App-V product code. The product code is unique for each App-V client type and version. Select the correct product code of the existing App-V release from the following table.
Product Code for Desktop Client
Product Code for Client for Remote Desktop Services