STM32F4 pack gives errors

Error: Device Support not found:
Device: STM32F407VGTx
Vendor: STMicroelectronics
The device support might be part of a Software Pack.
Please visit http://www.keil.com/dd2 to identify and download the missing Software Pack.

... and so I did. It installed the software pack, but it does not seem to work with the version of uVision that we are using. Moreover, when I try to open a project for an STM32F407, it will tell me there are errors loading the software packs:

Error loading software packs
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3666,19):
Error parsing node '#text' :no declaration found for element 'workingDir'
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3667,18):
Error parsing node '#text' :no declaration found for element 'arguments'
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3676,60):
Error parsing node '#text' :no declaration found for element 'gpdsc'
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3676,60):
Error parsing node '#text' :attribute 'name' is not declared for element 'gpdsc'
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3677,17):
Error parsing node '#text' :element 'workingDir' is not allowed for content model 'All(description,select,command,project_files,files,extensions)'
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\2.7.0\Keil.STM32F4xx_DFP.pdsc(3792,141):
Error parsing node '#text' :attribute 'generator' is not declared for element 'component'

The version of Keil uVision may be older, but we are reluctant to upgrade because older projects will have to undergo a new round of system testing so we are sure the upgrade doesn't break existing code. That would be a considerable amount of work.

Is there a way to get the STM32F4 support working under this version of uVision?

IDE-Version:
µVision V5.11.1.0
Copyright (C) 2014 ARM Ltd and ARM Germany GmbH. All rights reserved.

License Information:
<Removed>

Tool Version Numbers:
Toolchain:        MDK-ARM Standard Cortex-M only  Version: 5.11.0.0
Toolchain Path:    C:\Keil_v5\ARM\ARMCC\bin\ 
C Compiler:         Armcc.Exe       V5.04.0.49
Assembler:          Armasm.Exe       V5.04.0.49
Linker/Locator:     ArmLink.Exe       V5.04.0.49
Librarian:             ArmAr.Exe       V5.04.0.49
Hex Converter:      FromElf.Exe       V5.04.0.49
CPU DLL:               SARMCM3.DLL       V5.11.0.0
Dialog DLL:         DARMCM1.DLL       V1.11.00.0
Target DLL:         STLink\ST-LINKIII-KEIL_SWO.dll
Dialog DLL:         TARMCM1.DLL       V1.08.00.0

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