The article discusses an issue encountered while installing ExFlow ISV and provides a solution. The error message "Request for the permission of type 'System.Security.Permissions.FileIOPermission' failed" is caused by the package zip file being blocked. To resolve this, the zip file needs to be unblocked before extracting it. The article suggests right-clicking on the file, going to Properties, and checking the Unblock checkbox if it is unchecked. This tip can be helpful for anyone working with zip files and experiencing issues with the AXUpdateInstaller.
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