Issues deploying App to embedded device .NET Compact Framework error

We have a developer who has made and tested an app for a Motorola MC55A device running Windows Embedded 6.5 Classic.  It had been running fine up until they recently tried to install a later version of the app and then the device threw up what appears to be a .NET versioning error (see screenshot attached), installation log shown below.

Looking at the installed version of .NET Compact Framework on the developers machine it appears that they’re using 3.5.7283.00, however as can be seen below the device is using the newer 3.5.9085.00.  Therefore the first thing we did was look for a more up-to-date version for their machine, but after some pretty extensive searching we were only able to find the 3.5 redistributable on the MS website (https://www.microsoft.com/en-gb/download/details.aspx?id=65).  The problem we found was that this version is the 3.5.7283.00 build, which they already had installed.

How do we update the developers machine to a later build of the Compact Framework so that it matches the version on the device?  If this is a red herring has anyone any idea as to why the device will no longer install a updated version of the app which has already been working?

19/08/2016 12:39:21: Entered Install_Init().
                First Call: Yes
                Previously Installed: No
                Installation folder is: '\Windows'.
19/08/2016 12:39:21: Build 3.5.7283.00 created on Oct 10 2007 at 19:01:22
19/08/2016 12:39:21: Device CPU: 'ARMV4I', 05020000 (84017152)
19/08/2016 12:39:21: PocketPC 5.02
19/08/2016 12:39:22: AKU string : '.5.3.12.40'
19/08/2016 12:39:22: OEM info   : 'MOTOROLA MC55A'
19/08/2016 12:39:22: Our trust level is: 2
19/08/2016 12:39:22: User   LCID: 2057
19/08/2016 12:39:22: System LCID: 2057
19/08/2016 12:39:22: Invoker's command line: '0xeb764dbe-0'
19/08/2016 12:39:22: Memory status, K --------------------------
19/08/2016 12:39:22:   Load           : 32
19/08/2016 12:39:22:   Physical       : 238312
19/08/2016 12:39:22:   Physical free  : 163212
19/08/2016 12:39:22:   Virtual        : 32768
19/08/2016 12:39:22:   Virtual free   : 29184
19/08/2016 12:39:22: Storage status, K -------------------------
19/08/2016 12:39:22:   Available to us: 658792
19/08/2016 12:39:22:   Total storage  : 732708
19/08/2016 12:39:22:   Available total: 658792
19/08/2016 12:39:22: -------------------------------------------
19/08/2016 12:39:22: About to process registry.
19/08/2016 12:39:22: Opened CF registry key OK.
19/08/2016 12:39:22: Looking for upgradeable installations for version '3.5.7283.00'
19/08/2016 12:39:22: Got version value '3.5.9085.00'
19/08/2016 12:39:22: Upgradeable installation '3.5.9085.00' detected.
19/08/2016 12:39:22: Downgrade attempt detected as newer version '3.5.9085.00' has been found in ROM.
19/08/2016 12:39:22: Record '3.5.9085.00' preserved because this version is in ROM.
19/08/2016 12:39:22: CF registry key closed.
19/08/2016 12:39:22: Installation can't continue as newer version detected.
.NET-error-on-device.JPG