The latest patch for Winds of Winter 1.1. Fixed CTD at turn 20, unfortunately I had to also remove the unit descriptions and revert my change to the Dragonstone Swordsmen. Never had problems with these before, but for some reason they were making the game crash.
Note: This is not save-game compatible, and requires you download the version 1.1 first.
If you're still having problems with the turn 20 CTD bug, I'm uploading an optional 1.3 patch which should fix it. You may need it, you may not. I'm not sure how many people are experiencing the bug.
I am quite certain it's the Swordsmen and not the descriptions.
I'm assuming it is, but even after removing both changes, it still crashed, so I'm not sure. I ultimately had to take the old version and just add the strat changes and scripting, then it worked.