Just thought I'd post here to potentially help anyone struggling the way I was installing this.
I tried to use this because I couldn't install the new TWRP using the existing CWM as per the other thread.
However, I got the process crashes during setup. I tried the clean actions three times using three different SD cards, each time making sure I didn't install the Gapps file, still, it wouldn't let me through the setup.
I then tried to just install the LN14.1 zip file, & again it crashed, this time I spotted that the clock was shown in the top right-hand corner. I pulled down on that corner & it showed me settings icons, including wifi. I went into network settings through that & set up wifi. Pressed back & it took me to setup, however, I could now go through the 'set up from cloud' option, which didn't crash.
From there I simply added google account & selected don't install any existing apps or backups etc.
Setup then completed. As soon as that was done I powered down, popped the sd recovery card back in & installed TWRP recovery, rebooted again, then installed Gapps.
Took sd card out, rebooted again, & voila, a fully working up to date LN14.1 at last.
It could be something very specific to my device/setup, but just in case it's not, figured I'd post here to potentially help others with the same thing. My thanks to Amaces for putting in so much hard work, & to digixmax for doing such great simple & easy to follow instructions. If these instructions could cause further issues for anyone, let me know & I'll delete it.