To install a previous version:

1) Unsubscribe from the mod on this website
2) Click the link below for the version you want
3) Select DOWNLOAD ALL (top-right corner)
4) Once the zip file is downloaded, open it and copy the folder that looks like "1540083970v15".
5) Paste this folder in "Documents\My Games\Sid Meier's Civilization VI\Mods"
6) Go to Additional Content (from the Civ6 main menu) and enable the mod


Version 21 (June 7, 2019)
https://drive.google.com/drive/folders/1NxCvWtokipy42TDJ7DMp1N8My-bxeX3J?usp=sharing

Version 20 (June 7, 2019)
bugged, fixed with Version 21

Version 19 (June 7, 2019)
bugged, fixed with Version 21

Version 18 (June 6, 2019)
bugged, fixed with Version 21

Version 17 (May 18, 2019)
bugged, fixed with Version 21

Version 16 (May 17, 2019)
bugged, fixed with Version 21

Version 15 (Feb 27, 2019) Requires RISE AND FALL, but not GATHERING STORM
https://drive.google.com/open?id=1keFKs_Nm46VSSl5ahfC6CDcyR9EJk5uo