The few most recent changelogs will be listed here in case you'd like to see what has been changed across the latest versions of MCA.
MCA 5.2.3 - 1.10.2
Fix: Villagers will now properly regenerate their max health (courtesy of SilentChaos512).
Fix: Crash when placing a memorial item will no longer occur (courtesy of bloodmc).
Fix: Additional crash when dropping a baby has been fixed (courtesy of bloodmc).
MCA 5.2.2 - 1.7.10 and 1.10.2
Change: RadixCore v2.1.2 is now required.
Change: Villagers will now build mines from the top down.
Fix: Crash when villagers take damage with villager overwriting turned off has been fixed.
Fix: Crash while dropping a baby has been fixed.
Fix: Occasional crash caused by story progression on servers has been fixed.
Fix: Crash when using Extra Utilities' Peaceful Table on a villager has been fixed.
Fix (1.10.2): Villagers now properly sleep in their beds.
Fix (1.10.2): Family members no longer drop an extra memorial item.
Fix (1.10.2): Memorial blocks no longer drop a useless item that causes crashing.
Fix (1.10.2): Fence gate placed while mining now faces the right direction.
MCA 5.2.1 - 1.7.10 and 1.10.2
Fix: Crash when attacking creatures with villager overriding off.
Fix: Crash when looking at memorial objects or tombstones.
Fix: Crash when loading a save where a villager is fishing.
Fix: Crash when loading existing worlds up.
Fix: Potential crash with mods that cause actions on right-clicking.
Fix: Interaction dialogue will no longer open if another mod's GUI opens before it.
Fix: Crash no longer occurs when using the whistle in SMP.
Fix: Crash when using Special -> Check Happiness no longer occurs.
Fix: Family members will now use melee weapons.
Fix: Farmers no longer replant a melon stem when harvesting melons.
MCA 5.2.0 - 1.7.10 | 1.8.9 | 1.9 | 1.9.4 | 1.10.2
MAJOR-CHANGE: MCA now uses a different system for remembering players' progress. It will attempt to convert your progress as you log on. Check your server/client console to see if the conversion succeeded, or for instructions if it did not.
MAJOR-FIX: All identity confusion and other oddities on LAN should now be fixed, for good!
Feature: Thousands of new names, courtesy of AndreAssassins.
Feature: Parent labels for children of same-sex couples now show the correct gender.
Feature: No more Mojang-based movement AI! Fixes several issues with villager AI. (Probably creates some as well.)
Feature: Your spouse will now end the marriage if their hearts remain negative for too long.
Feature: Added a configuration option to enable structure spawning on dedicated servers.
Feature: Children are now properly labelled as "the Child", and adults with no profession are labelled as "the Villager".
Feature: Added fishing chore.
Feature: Whistle now brings up a list of family members you can call.
Feature: You are now properly alerted when your children or spouse dies.
Feature: Added Warrior profession.
Feature: Revamped hiring system, allowing you to hire villagers for hours or even days, extend their contract, or dismiss them early.
Feature: Added combat AI, allowing the ability to configure villagers' combat behavior.
Feature: Villagers related to you now drop a special item in a chest when they die, which can be used to bring them back to life!
Feature: Added new, unique boss - the Grim Reaper. Defeat him to receive the Staff of Life, used to revive dead villagers.
Feature: Added the ability to become a Baron or Baroness, provided your villagers are happy. Barons/Baronesses can tax their villagers.
Change: If your spouse is a priest or cleric, you can no longer use their special abilities. Other players still can.
Change: Guards can no longer be hired. Hire warriors instead.
Fix: Priests now properly tell you that you're not married when appropriate.
Fix: Added a fix for click-throughs on the main interaction GUI.
Fix: Existing guards are no longer counted when spawning more guards.
Fix: Married guards no longer stop patrolling.
Fix: The possibility of more than one villager appearing from one cured zombie has been fixed.
Fix: Closed spaces in family house roof where mobs could spawn.
Fix: Villagers had stopped blinking.
Fix: Infected villagers no longer bite a player in creative mode.
Fix: Overlapping "Infected" popup on adult children has been moved.
Fix: Humans' bounding boxes now properly grow when needed.
Fix: Resolved lag caused by a guard's patrolling AI.
Fix: Issue where children wouldn't harvest specific crops has been fixed.
Fix: Malformed response when instructing a child to farm has been fixed.
Fix: Trade progression issues on 1.8.9 have been fixed.
Fix: Gravestones no longer damage creatures walking through them.
Fix: Some odd looking villager models have been fixed on 1.9+.
MCA 5.1.3 - 1.9
Fix: Previous villager trade fix by Awkanic is now verified as working.
MCA 5.1.2 - 1.7.10 and 1.8.9
Feature: Translations have been updated.
Change: Clarified the additional gift item configuration setting.
Fix: Crash when telling children to farm on servers no longer occurs.
Fix: Graphics issue while holding babies no longer occurs.
Fix: Married guards will no longer patrol at night.
Fix: The Minecraft client no longer crashes if a player is kicked from the server while using a crystal ball.
Fix: Potential for despawning villagers while using other mods should stop.
Fix: Crash related to zombie infections should no longer occur.
Fix: Model loading error on the tombstone will no longer appear.
Fix (1.8.9): Villager trades will now level up properly.
MCA 22.214.171.124-1.7.10 and 1.8
Fix: Infected children will no longer grow up when attempting to cure the infection.
Fix: Removed the limit on interactions, no more villagers stuck with "This villager is being interacted with."
MCA 126.96.36.199-1.8 and 1.7.10
Feature: You can now disable the dimension whitelist and enable spawning in all dimensions in the config.
Fix (1.8): Rejoice! Crashing will no longer occur when using existing worlds after installing MCA.
Fix (1.8): Armor now appears properly on villagers.
Fix: An exploit that allowed players to spawn structures on a server has been patched.
Fix: Villagers will no longer defend themselves while remaining asleep.
Fix: Children now render correctly when riding horses.
Technical: Fixed performance issue caused by sleeping AI. Server performance should be improved.
All features, changes, and fixes from 1.7.10 with the exception of the ability to apply a player's skin to a villager.
Feature: Added ability to enable/disable structure spawning.
Feature: Updated translations.
Fix: Villager guards now account for armor on others.
Fix: Engagement gifts were only retrievable from your spouse.
Fix: It was possible for your spouse to be stuck holding a baby when you marry them.
Fix: Possible crash while ending a marriage has been fixed.
Fix: All item icons now display correctly.
Fix: Villagers in an arranged marriage had the chance of getting married to someone else due to story progression.
Technical: MCA is now built on the latest recommended version of 1.7.10 Forge