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#11
That is not what was recommended in this thread. Why are you messing with install.wim at all? Either:
1. Just let Microsoft's Media Creation Tool create the USB flash drive for you (preferred) or
2. Download the ISO file with Microsoft's Media Creation Tool. It will contain install.esd. Then you can use a flash drive, MBR partition, FAT32 formatted, marked as active, and just copy all the files from the ISO file to it without having to mess with splitting any install.wim file.
I think the problem you are having is at the stage where setup is trying to copy over files from the split install.wim file.
Also, if you for some unknown reason you really, really need to use an ISO file with install.wim, there is a method to create a two-partition USB installation flash drive that does not involve splitting install.wim.
Create Bootable USB For Windows 10 Install.wim Larger Than 4GB
Another option is to manually set up the internal SSD for booting, and then apply the Windows image and do the setup completely manually.