Where can I find the latest Collins Scrabble Words list in a text file? Googling this seems surprisingly difficult to find. I can only find some sites where I can check if the word is in the list.
The Words List seems to be protected by copyright. I highly doubt downloading the entire list - especially in an easily accessible format - is strictly speaking legal.
I found this on the Collins website.
Collins is the only online Scrabble word finder to use the official tournament word list.
So, I googled
official tournament word list, and found this site, of the North American Scrabble Players Association. There it's stated that the Word List can be bought in print or digital format. The digital copy also needs a certain program:
NASPA members may use the free word study and adjudication tool, NASPA Zyzzyva, to access a licensed electronic copy of this word list. OTCWL2016 is included beginning with NASPA Zyzzyva version 3.1.0.
NASPA Zyzzyva is available for download to Windows and Mac machines at the NASPA Zyzzyva download site, which includes download and installation instructions.