DLC Update (11th December 2015)

- Added Fallen Enchantress Spellbook, Monster Manual and Manual

Changelog for Update 2.1 (added 28 September 2017):

- Updated to support 4K, 5K, and 8K screen resolutions
- Custom faction abilities now have descriptions
- Updated the Slow spell so that the initiative penalty is more punishing

Fallen Enchantress: Legendary Heroes

Changelog for Patch 2.4 (added 17 October 2018):

Features
- Dwarf Lord gains access to Alchemist and other special buildings

UI
- Updated font engine for high DPI display

This is most likely a bug in the GOG changelog. The quoted update text is probably for Sorcerer King: Rivals and not for Fallen Enchantress.

FELH update should have:
2.2 Fixed the Beastlord's Tame ability
2.2 Fixed the First Aid ability
2.2 Fixed the Diplomat's Silver Tongue ability
2.3 Fixes an issue where Zone of Control lines don't draw in game within game (ie: if you load a game while playing).
2.4 Fixed an issue where custom faction abilities didnt show what they did.

Links:
https://forums.elementalgame.com/486175/fallen-enchantress-legendary-heroes-22
https://forums.galciv3.com/486735/fallen-enchantress-legendary-heroes-23
https://forums.elementalgame.com/491408/fallen-enchantress-legendary-heroes-24

GOG changelogs:

Patch 2.51 (31 October 2019)

Unit movement engine optimizations
AI update to be more greedy about getting goodie huts
Early game technology costs reduced
Default unit movement increased from 2 to 3 tiles.
Sovereign default combat speed increased from 22 to 32
Sovereign default HP increased from 20 to 28.
Several bug fixes to late game instability

Patch 3.0 (1 September 2021)

Tile yield update on screen aborts immediately if the terrain is invalid for a city (perf)
Fixed crash bug where garbage characters could get inserted into a scene node
Increased the map tilt further so you can see more pretty stuff
Calc Military Might now longer force updates the battle rank of units. (perf)
AI city updating is now multithreaded (perf)
CalcBattleRank changed to automatically cache the battlerank of the unit (major perf boost)
Units now always get a battlerank of at least 1 to ensure caching of battlerank
Sub-units of an army are no longer recalculated unless expressly ordered
Thread safe city count method added
Fixed a crash deadlock
AI monsters less likely to attack a city on lower difficulties
Monsters now use a cached combat rating to determine city strength (performance)
Fixed multiple crash deadlocks
Unit vector sized at 10 at start to reduce increments. (perf)
Timer update increased from 1ms to 0.5ms
Conclaves provide more research but less production and money
Fortresses provide more production but less money and research
Towns provide more money but less production and research
New improvement: Tower of Knowledge. Provides +1 research per essence
Tiny map size increased to 5x3
Small map increased from 5x4 to 6x4 (20 to 24 sectors)
Medium map size increased from 6x5 to 7x5 (30 to 35 sectors)
Large map size increased from 7x6 to 9x6 (42 to 54 sectors)
Huge map size increased from 8x7 to 12x8 (56 to 96 sectors)
Wrote a replacement for toupper() that is much faster
Lots of new quests
AI improvements
Quest based champions added
Units take slightly longer to produce to balance the availability of more champions.