Cannot install Windows 10 - Macbook Pro Retina 13

The original 128GB SSD on my Macbook Pro Retina 13 (Mid-2014 and running Mojave 10.14.4) was beginning to fill up and I therefore researched the issue and eventually bought a 1TB OWC Aura Pro X2 as a replacement.  After installation, the macbook works as well as the original and, indeed, even seems to be a little faster, albeit with a slight increase in generated heat (which I am not concerned about).

With almost 900GB of space now free, I tried to install Windows 10 Pro on a separate partition (obvs!). Using Bootcamp, an ‘official’ download of windows (Oct 2018 version) from Microsoft and a Sandisk USB3 stick, the whole process seemed to go smoothly,  I used a 128GB partition and the Windows set up all seemed to be OK following a restart and ‘getting ready’ screen when the following message appeared:

‘The computer restarted unexpectedly or encountered an unexpected error.  Windows installation cannot proceed.  To install Windows, click “OK” to restart the computer and then restart the installation’

I therefore restarted the laptop (several times!) only to be greeted with the same message.

I went back to Mac OS via a reboot with the Option key (Windows 10 was there as an option but selecting it just went to a blank, black screen).  I then deleted the partition that had just been created by Bootcamp and, just in case, downloaded another copy of the Windows 10 Pro ISO file from Microsoft and used a different USB stick and started the whole Bootcamp process again with exactly the same end result.  

Can anybody say where things might be going wrong and suggest a solution please.  This is annoying me as one of the main reason why I bought the large and very expensive 1TB SSD was to install Windows and it just ain’t working. I am assured by OWC that I have the right SSD for my Macbook and, as mentioned above, everything else seems to work as it should.

Sorry for the long post but I thought it best to lay out the whole saga.  Thanks in advance for any help.