"Up to date" even though I am running version 1507 (RTM build of Windows 10); how to get 1803 (Redstone 4)?

Right, so I am back finally with news.

I'm actually smart enough to use a hypervisor especially since I finally have one useful enough to figure out what is wrong... and I would refuse to believe that my firmware is the reason why I can't update past 1607 but I have this to show so I can get some more feedback...

The one on the left is my computer which has Anniversary Update (Redstone 1). The one on the right is a virtual machine connection running Redstone 5 with no issues whatsoever. Clearly I can see that, again, the BIOS information is the most discriminatory factor for my persistent upgrade issues.

There aren't three system reserved partitions. Everything sounded OK, until you mentioned that. Try...

(a) Deleting all the partitions at that screen, until only unallocated space is left.

(b) Select the unallocated space created.

(c) Click the "Next" button.

It sounds like you manually created partitions yourself, but you really should let Windows do it.

... uh, yes? I did use the MCT as asked to get the latest install media for Windows 10 Professional, version 1803, build 17134. Of course, something could have gone wrong during the file transfer process. How am I supposed to know that, however?

Yes, I am able to select the flashdisk I used as a bootable UEFI system process (the MoBo itself came pre-installed with Windows 8 and therefore uses a UEFI pre-initialization environment by default), and I have (otherwise not) been successful in launching setup (from which I did completely wipe the harddisk drive and set up the new partitions I wanted, including a 100 GB Windows partition and three mandatory system-reserved partitions) and copying files. After this, it is supposed to then restart to the harddisk drive UEFI partition, this is where the computer starts having issues with getting Windows loaded.

(1) Did you get the download from here...?...

https://www.microsoft.com/en-us/software-download/windows10

Download Windows 10 -  currently, this is version 1803

Match it to your Edition (Pro, Home, etc.), Language, & Architecture (x64/64-bit or x86/32-bit), as the article says.

(2)  Did you boot to BIOS Setup & set it for UEFI, if you've got that...?...

https://www.sysnative.com/forums/hardware-tutorials/23010-get-access-bios-settings-boot-menu-f-keys-hotkeys-system-manufacturer-oem.html

Get access to BIOS settings & Boot Menu: F-keys/Hotkeys by System Manufacturer (OEM)

(3) Then plug in the USB Installation media & boot to it through the BIOS Boot Menu & select the UEFI option, if offered?

(4) Did you delete all the partitions at the "Choose a partition" screen, until only allocated space remained, select the unallocated space, & click "Next"?

... whereas when I went back to the official RTM DVD-ROM, the setup went through without any problems.