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Upgrade Windows 8.1 laptop supplied downgraded to Windows 7 Pro

I bought a new Latitude E5550 laptop from a Dell authorised reseller in 2015. It was ordered with Windows 8.1 Pro downgraded to Windows 7 Pro and has subsequently been updated to Windows 7 SP1 Pro via MS Windows Update process. The Dell drivers and BIOS are the latest versions available from the Dell support web site.

With Windows 7 nearing end of support from Microsoft, I've been preparing to upgrade to Windows 8.1 Pro or Windows 10 Pro.

At some time in the past I have written down an OEM key and a BIOS key, but I can't remember how I got these as there is no Windows COA label anywhere on the laptop, box or supplied paperwork. When I run some of the key tools, they return the same OEM key that I've written down but I can't find any tools that display the BIOS key. When I try RWEverything, the ACPI tables do not contain an MSDM tab. My understanding is that this means there is no key stored in the BIOS but that seems to contradict what I've read about the move to BIOS keys for Windows 8. I believe the OEM key is a generic key for Dell systems as I have seen the same key in numerous web forum threads, so I'm not sure if that requires some additional code for activation.

It is worth noting that I had to replace the motherboard a year ago due to a power regulator failure, but afterwards there have never been any issues with Windows license/activation or prompts to enter a key.

The output from running 'slmgr -dlv' is as follows;

 

 

<pre>
Software licensing service version: 6.1.7601.17514

Name: Windows(R) 7, Professional edition
Description: Windows Operating System - Windows(R) 7, OEM_SLP channel
Activation ID: 50e329f7-a5fa-46b2-85fd-f224e5da7764
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 00371-00178-926-700524-02-1033-7601.0000-0312015
Installation ID: 009484961446099316167882738952812155433706052016832600
Processor Certificate URL: <a href="http://go.microsoft.com/fwlink/?LinkID=88338" target="_blank">http://go.microsoft.com/fwlink/?LinkID=88338</a>
Machine Certificate URL: <a href="http://go.microsoft.com/fwlink/?LinkID=88339" target="_blank">http://go.microsoft.com/fwlink/?LinkID=88339</a>
Use License URL: <a href="http://go.microsoft.com/fwlink/?LinkID=88341" target="_blank">http://go.microsoft.com/fwlink/?LinkID=88341</a>
Product Key Certificate URL: <a href="http://go.microsoft.com/fwlink/?LinkID=88340" target="_blank">http://go.microsoft.com/fwlink/?LinkID=88340</a>
Partial Product Key: 733WD
License Status: Licensed
Remaining Windows rearm count: 2
Trusted time: 20/11/2019 14:12:17
</pre>

The laptop came with Dell DVD media for Windows 8.1 Pro but I can't find any instructions for how to use this to revert back from the downgrade to Windows 7, and I don't know what version of Windows will be in the recovery partition on the HDD.

Can anyone provide advice on how to do the upgrades, or at least confirm they are possible, for the following scenarios;

a) Upgrade my current Windows 7 SP1 Pro to Windows 8.1 Pro using the Dell DVD supplied with my laptop.

b) Upgrade Windows 8.1 Pro (after step a) to Windows 10 Pro.

c) Upgrade my current Windows 7 SP1 Pro directly to Windows 10 Pro, without performing step b above.

Do any of the above preserve installed 3rd party applications, or at least user files and documents. I will have backups anyway, but it would be useful to know the amount of effort in advance.

Thanks.

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