A new version of After the End, 0.6.1, just went up on Mediafire. Here's a link to it:
http://www.mediafire.com/download/494r8i92dnplt8o/After the End 0.6.1.zip
This is mainly a bugfix version, that includes fixes to several major problems related to Horse Lords. There are still a few content additions, but the bug fixes are probably the most important part. Save games from 0.6 should be fully compatible with this version.
Extra Content:
Earthquake events.
Occultist sect traits: Old Ones, Masons, Diabolic Pact.
Added a sub-mod to fill in "non canon" de jure empires. Also adds a decision to form America.
Some more provinces in the far NE of Canada, Cote-Nord.
A few piratey Brethren additions.
Unique Mesoamerican coats of arms.
Bug Fixes & Tweaks:
Fixed a CTD that could occur with Horse Lords enabled.
Fixed the purple portrait aura.
Fixed tribes converting to feudal.
Fixed pagan subjugation CB problems.
Fixed problem with merchant republic gaining a religious head title (e.g. when reforming pagan faith).
Fixed Cetic Emperor figurehead trait bug related to CBs.
Fixed empire of Cascadia.
Fixed several issues with the Pacific invaders.
Strip claims to the Americanist presidency, and some more minor election tweaks.
Merged in vanilla disease and seduction nerfs.