From MaGog's logs for 20 April:

NOTE! Probably CHANGED FILE Divinity: Original Sin - Enhanced Edition, all_files, Mac OS X installer, English, dl_ver: 2.0.119.430 (gog-8) ***TO*** 2.0.119.430 (gog-10)

NOTE! Probably REMOVED FILE Divinity: Original Sin - Enhanced Edition, all_files, Spanish language fix [Mac OS X]

NOTE! Probably ADDED FILE Divinity: Original Sin - Enhanced Edition, all_files, Localization fix [Mac OS X], dl_ver: ***TO***

NOTE! CHANGED Divinity: Original Sin - Enhanced Edition, changelog (http://www.an-ovel.com/downloads/chg/chg_1445516929.htm)
NOTE! ADD +++ Update (20 April 2016)
NOTE! ADD +++ We've uploaded a new Mac OS X patch and offline DMG that fixes an issue with the game's translations not showing up in-game.





NOTE! Probably REMOVED FILE Kerbal Space Program, all_files, Patch 1.0.5 build 1028 [Windows] (dl_ver: 1.0.5 (gog-4) -> 1.0.5.1028 (gog-5))





NOTE! CHANGED Gothic 2 Gold Edition, title_ru: ***TO*** Готика 2 Gold Edition

In case you're wondering what changed:
- What was previously called the Hungarian manual, which was actually Turkish, is now called the Turkish manual
- There is a new Hungarian manual

Rightio.

Uprising updated, changelog:

Patch 1.5 (21 April 2016)
Improved stability for Windows 7 and 10.

I got quite a bit of downloading to do, thanks to everyone for posting updates & changelogs.

From MaGog's logs for 21 April:

NOTE! Probably CHANGED FILE Hyper Light Drifter, all_files, Windows installer, English, dl_ver: 4-11-2016 hotfix (gog-5) ***TO*** The Invincibility Patch (gog-6)

NOTE! Probably ADDED FILE Hyper Light Drifter, all_files, The Invincibility Patch (gog-6) [Windows], dl_ver: ***TO*** gog-5 -> gog-6

NOTE! Probably CHANGED FILE Hyper Light Drifter, all_files, Mac OS X installer, English, dl_ver: 4-12-2016 hotfix (gog-5) ***TO*** The Invincibility Patch (gog-6)

NOTE! Probably ADDED FILE Hyper Light Drifter, all_files, The Invincibility Patch (gog-6) [Mac OS X], dl_ver: ***TO*** gog-5 -> gog-6

NOTE! Probably CHANGED FILE Hyper Light Drifter, all_files, Linux installer, English, dl_ver: 4-12-2016 hotfix (gog-3) ***TO*** The Invincibility Patch (gog-4)

NOTE! Probably ADDED FILE Hyper Light Drifter, all_files, The Invincibility Patch (gog-4) [Linux], dl_ver: ***TO*** gog-3 -> gog-4

NOTE! CHANGED Hyper Light Drifter, changelog (http://www.an-ovel.com/downloads/chg/chg_1452863689.htm)
NOTE! ADD +++ The Invincibility Patch (21 April 2016)
NOTE! ADD +++ Added frames of invincibility to dash
NOTE! ADD +++ Warp pads now refill health kits
NOTE! ADD +++ Achievements for Dash challenge + Soccer
NOTE! ADD +++ for KB+M: can now choose option for KB direction dash
NOTE! ADD +++ Sped up heal several frames
NOTE! ADD +++ Adjusted various room scenery/hitches across the world
NOTE! ADD +++ Fixed Alt Drifter dash catch
NOTE! ADD +++ Fixed a credits crash
NOTE! ADD +++ Can now go to full credits again after you beat the game through “credits” menu option
NOTE! ADD +++ Health kits no longer recharge at warp pads
NOTE! ADD +++ Reduced number of invincibility frames in the dash
NOTE! ADD +++ Extended heal time slightly





NOTE! Probably CHANGED FILE Uprising: Join or Die, all_files, Windows installer, English, dl_ver: 1.05 (gog-10) ***TO*** 1.5 (gog-12)

NOTE! CHANGED Uprising: Join or Die, changelog (http://www.an-ovel.com/downloads/chg/chg_1453195863.htm)
NOTE! ADD +++ Patch 1.5 (21 April 2016)
NOTE! ADD +++ Improved stability for Windows 7 and 10.

NOTE! CHANGED Uprising: Join or Die, file_size: 210 MB ***TO*** 306 MB

From MaGog's logs for 21 April:

NOTE! ADDED FILE Forgotten Realms: The Archives - Collection Three, downloadables, Dungeon Hack: Windows installer, German (setup_dungeon_hack_german_2.0.0.6.exe; 1.0 (gog-6); Thu, 21 Apr 2016 17:07:51 GMT; 29,559,400)

NOTE! ADDED FILE Forgotten Realms: The Archives - Collection Three, downloadables, Dungeon Hack: Mac OS X installer, German (dungeon_hack_german_2.0.0.1.dmg; 1.0 (gog-1); Thu, 21 Apr 2016 17:07:40 GMT; 24,727,528)

NOTE! CHANGED FILE Forgotten Realms: The Archives - Collection Three, downloadables, Dungeon Hack: Mac OS X installer, English (no change in name; gog-1 ***TO*** 1.0 (gog-1); Tue, 18 Aug 2015 13:33:21 GMT ***TO*** Thu, 21 Apr 2016 17:07:18 GMT; 25,091,619 ***TO*** 24,952,228)

NOTE! CHANGED FILE Forgotten Realms: The Archives - Collection Three, downloadables, Dungeon Hack: Mac OS X installer, French (no change in name; gog-1 ***TO*** .90 (gog-1); Tue, 18 Aug 2015 13:33:48 GMT ***TO*** Thu, 21 Apr 2016 17:07:32 GMT; 25,080,393 ***TO*** 24,937,701)

NOTE! ADDED FILE Forgotten Realms: The Archives - Collection Three, downloadables, Dungeon Hack: Linux installer, German (gog_dungeon_hack_german_2.1.0.3.sh; 1.0 (gog-3); Thu, 21 Apr 2016 17:06:31 GMT; 18,735,479)

NOTE! CHANGED Forgotten Realms: The Archives - Collection Three, changelog (http://www.an-ovel.com/downloads/chg/chg_1436873631.htm)
NOTE! ADD +++ Update (21 April 2016)
NOTE! ADD +++ We've added the German version of Dungeon Hack to everyone's accounts.
NOTE! ADD +++ We'd like to thank Thalmorag for their help with the German version after our ebayed version turned out to have a faulty diskette.

NOTE! CHANGED Forgotten Realms: The Archives - Collection Three, languages: Audio and text: English, French (Dungeon Hack only) ***TO*** Audio and text: German (Dungeon Hack only), English, French (Dungeon Hack only)

[Thank you, thalmorag]





NOTE! ADDED FILE Master of Magic, downloadables, spellbook (German) (mom_spellbook_german.zip; Thu, 21 Apr 2016 17:39:55 GMT; 15,132,261)

NOTE! CHANGED Master of Magic, bonuses: manual (153 pages), 2 HD wallpapers, spellbook, advances chart, in-game soundtrack ***TO*** manual (153 pages), 2 HD wallpapers, spellbook, advances chart, spellbook (German), in-game soundtrack

[No changelog]

From MaGog's logs for 22 April:

NOTE! Probably CHANGED FILE Darkest Dungeon, all_files, Windows installer, English, dl_ver: 13916 (gog-14) ***TO*** 14017 (gog-15)

NOTE! Probably ADDED FILE Darkest Dungeon, all_files, Patch 14017 (gog-15) [Windows], dl_ver: ***TO*** 13916 (gog-14) -> 14017 (gog-15)

NOTE! Probably CHANGED FILE Darkest Dungeon, all_files, Mac OS X installer, English, dl_ver: 13916 (gog-15) ***TO*** 14017 (gog-16)

NOTE! Probably ADDED FILE Darkest Dungeon, all_files, Patch 14017 (gog-16) [Mac OS X], dl_ver: ***TO*** 13916 (gog-15) -> 14017 (gog-16)

NOTE! CHANGED Darkest Dungeon, changelog (http://www.an-ovel.com/downloads/chg/chg_1450711444.htm)
NOTE! ADD +++ Patch 14017 (22 April 2016)
NOTE! ADD +++ Fix to enemy move animations
NOTE! ADD +++
NOTE! ADD +++ Patch 13985 (22 April 2016)
NOTE! ADD +++ Fixed an issue around retreating from drowned crew while captured. It will now kill the hero with a warning in a confirm before attempting the retreat.
NOTE! ADD +++ Fix to a crash related to dying outside of combat with the loot window open and quitting the game.
NOTE! ADD +++ Disable heirloom exchange when you don’t have any heirlooms.
NOTE! ADD +++ Fixes for various strings
NOTE! ADD +++ Added in Localization for all new strings added in the Antiquarian Patch.

From MaGog's logs for 22 April:

NOTE! CHANGED Divinity: Original Sin - Enhanced Edition, features: Single-player, Multi-player, Co-op ***TO*** Single-player, Multi-player, Co-op, Achievements

[Same for Collector's Edition]

From MaGog's logs for 22 April:

NOTE! CHANGED Divinity: Original Sin - Enhanced Edition, changelog (http://www.an-ovel.com/downloads/chg/chg_1445516929.htm)
NOTE! ADD +++ Update (22 April 2016)
NOTE! ADD +++ Added GOG Galaxy support.

[No file changes in the standalone installers.]





NOTE! Probably ADDED FILE Galactic Civilizations III, all_files, Patch 1.70 (gog-6) [Windows], dl_ver: ***TO*** 1.61 (gog-5) -> Patch 1.70 (gog-6)

NOTE! Probably CHANGED FILE Galactic Civilizations III, all_files, DLC: Map Pack DLC: Windows installer, English, dl_ver: gog-1 ***TO*** 1.70 (gog-6)

NOTE! Probably CHANGED FILE Galactic Civilizations III, all_files, DLC: Mega Events DLC: Windows installer, English, dl_ver: gog-4 ***TO*** 1.70 (gog-6)

NOTE! Probably CHANGED FILE Galactic Civilizations III, all_files, DLC: Mercenaries Expansion Pack DLC: Windows installer, English, dl_ver: 1.61 (gog-5) ***TO*** 1.70 (gog-6)

NOTE! Probably CHANGED FILE Galactic Civilizations III, all_files, DLC: Precursor Worlds DLC: Windows installer, English, dl_ver: 1.61 (gog-5) ***TO*** 1.70 (gog-6)

NOTE! Probably CHANGED FILE Galactic Civilizations III, all_files, DLC: Revenge of the Snathi DLC: Windows installer, English, dl_ver: 1.61 (gog-5) ***TO*** 1.70 (gog-6)

NOTE! CHANGED Galactic Civilizations III, changelog (http://www.an-ovel.com/downloads/chg/chg_1444400383.htm)
NOTE! ADD +++ Patch 1.70 (22th April 2016)
[Too long to quote, see link above.]

Nice.

So... is it August 31, 2014?

Good point. I guess it is.