looks like the update's are not on the dell server.

Downloading component 53 of 74

Creating folder ******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1

Creating file ******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1\DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Downloading from https://downloads.dell.com/FOLDER08239444M/1/DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Error downloading file *******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1. One or more errors occurred. (Response status code does not indicate success: 404 (Not Found).)

Creating file ******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1\DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Downloading from https://downloads.dell.com/FOLDER08239444M/1/DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Error downloading file ******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1. One or more errors occurred. (Response status code does not indicate success: 404 (Not Found).)

Retrying download of file due to errors.

Creating file ******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1\DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Downloading from https://downloads.dell.com/FOLDER08239444M/1/DellDockFirmwarePackage_WD19_WD22_Series_01.00.24.exe

Error downloading file *******\Dell\Custom_Catalog_Repository\Latitude5420\FOLDER08239444M/1. One or more errors occurred. (Response status code does not indicate success: 404 (Not Found).)

Retrying download of file due to errors.