You're very welcome! Hopefully the original problem is solvable so that you can at some point upgrade to the new release of Windows though, since obviously being able to roll back safely only gets you back to where you were rather than allowing you to move forward.
In terms of booting and WinPE, that may be worth clearing up for your own understanding in case it's useful for troubleshooting later. First, the up/down boot menu where you choose between Windows and the Reflect Rescue isn't related to your new laptop, nor is that boot menu a replacement for the one you're probably thinking of where you choose your boot device, e.g. hard drive, USB drive, etc. What's going on behind the scenes is that there are actually two boot lists that run sequentially. First, your system firmware evaluates its "device-level" boot list, which is the list that would contain options such as your hard drive, USB drive, etc. If it chooses the hard drive, technically the entity that boots from there is called Windows Boot Manager. That is technically a database (called the Boot Configuration Database, or BCD) that maintains its OWN list of any Windows-based environments that exist anywhere on the hard drive(s) installed in the system, entirely separate from the system's device-level boot list, which is now out of the picture after it decided to boot from the hard drive. On most systems, the BCD only ever contains one entry for the installed Windows environment and therefore users never even see Windows Boot Manager, but the recovery boot menu option works by creating an additional entry. Other scenarios where users can have multiple entries here would be those who dual boot Windows (i.e. having multiple Windows versions installed on a PC) and certain advanced scenarios where you can have multiple entries that allow booting the same Windows environment in different ways, e.g. without a hypervisor running.
As for WinPE, that stands for "Windows Preinstallation Environment". It's essentially a stripped down version of Windows that was originally intended to offer enough hardware support and functionality to run Windows Setup and allow you to get "real" Windows installed, and for enterprises to run the custom installation environments they might create to facilitate automated system deployments. It has since also been used as the basis for the Windows Recovery environment that contains some basic tools to help troubleshoot or recovery from an unbootable system, e.g. Command Prompt, System Restore, Windows System Image Restore, etc. But since then, third parties like Macrium have found it useful as a foundation for their own bootable environments, because this "stripped down Windows" still has much of the functionality they need, e.g. support for USB devices, networking, BitLocker, etc., AND it supports the same drivers for these essential devices that "real" Windows does. But best of all, it can run actual Windows applications as long as the application doesn't depend on any components that are only available in "real" Windows. All of this makes life much easier for a company like Macrium that develops a Windows application and also needs to have a bootable recovery environment that can run their application and access hard drives, USB devices, network shares, etc.
And again, even when a bootable WinPE environment exists on the same hard drive that contains your Windows environment, as is the case with the recovery boot menu option, the files that each uses are completely separate. The recovery boot menu environment files are under c:\boot\macrium\WAxxFiles\media, and the way it works is that when you enable that option, Reflect adds an entry to Windows Boot Manager that points to those other (quasi-)Windows files on your hard drive as the boot path, rather than the "real" Windows boot files -- which is why no matter how messed up your Windows environment is, as long as Windows Boot Manager is still intact and those files are still there, you can boot into it. And once you're there, Reflect doesn't care at all what version of Windows is actually installed on the drive it's backing up or restoring.
Hopefully at least some of that was useful/interesting, and good luck with the user profile issue!