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I have a PC with Windows 8.1 (not pro) that was upgraded to Win 10. We've since realised the PC wasn't 'Pro' so need to upgrade to Win 10 pro. I was advised that a Win 10 Pro Pack isn't available yet so the only way is to downgrade to 8.1, then apply a Pro Pack, then upgrade again to Win 10 Pro. Upon trying to downgrade I've received a message saying
Remove new accounts
Before you can go back to a previous version of Windows, you'll need to remove any user accounts you added after your most recent upgrade. The accounts need to be completely removed, including their profiles.
You created 6 accounts (IIS APPPOOL\Classic .NET AppPool, NT SERVICE\MSSQL$SQLEXPRESS, IIS APPPOOL.NET v2.0 Classic, ...)
Go to Settings > Accounts > Other users to remove these accounts, and then try again.
Of course these virtual accounts aren't listed in the settings page or in Computer Management > Local Users and Groups and cannot be deleted. How do I remove these so I can downgrade, or make the downgrade process ignore them?
Someone else has posted a similar problem here and I've posted it on the MS forums here.
Many thanks. Unfortunately my colleague gave up and reimaged back to 8.1 ... but I'm sure this will be helpful to others. – Rory – 2015-09-02T18:16:03.777