Thanks for bearing with us in this thread. We’d like to announce that today we’ve introduced the addition of new installers, with implemented GOG Galaxy client.

Like Destro described it back in May, we decided to separate the „new" and „classic” installers, for your choice. So if you don’t care about the features like achievements or cloud-saves and don’t want to use GOG Galaxy, you can download the „Classic Game Installer", just like it was handled before. For games that have new installers, the default download view on „My account” will show the "GOG Galaxy Game Installers" - you will notice that, as it is visibly described in „My account” game view. To download the „classic” ones, just go to „Options" and choose „Classic Installers”.

The new GOG Galaxy Game Installers were added to +100 games - a selection of all games that make use of GOG Galaxy features. I'll post the current list of games with the new installers in a separate post.
Going forward, all new games that will use GOG Galaxy features, will now receive both GOG Galaxy Game Installer and Classic Game Installer.

Introduction of GOG Galaxy Game Installers doesn’t change anything in terms of keeping the Classic Game Installers up to date. As soon as we receive an update for any game, we will prepare an updated version of the classic installer, just like it was done in the past.

Edit: Pinned.

Here's the most up to date list of games with GOG Galaxy Installers:

8-bit Armies
8-bit Hordes
8-bit Invaders
80 Days
Agatha Christie - The ABC Murders
Aliens versus Predator Classic 2000
Anima: Gate of Memories
Aragami
Ashes of the Singularity
Baldur's Gate II: Enhanced Edition
Baldur's Gate: Enhanced Edition
BASEBALL STARS 2
Batman - The Telltale Series
BattleZone 98 Redux
BLACKHOLE
Blackwood Crossing
Bombshell
Breach & Clear: DEADline Rebirth
Caladrius Blaze
Candle
Celestian Tales: Old North
Corpse Party
Craft The World
Crookz - The Big Heist
Crypt of the NecroDancer
Darkest Dungeon
Day of the Tentacle Remastered
de Blob
de Blob 2
DEADBOLT
Deadly Tower of Monsters, The
Deathtrap
Deponia 4: Deponia Doomsday
Dex
Diluvion
Divinity: Original Sin - Enhanced Edition
Dragon's Dogma: Dark Arisen
Dungeons 2
Dying Light: The Following – Enhanced Edition
Eador. Imperium
EARTHLOCK: Festival of Magic
Edna & Harvey: Harvey's New Eyes
Elder Scrolls IV: Oblivion - Game of the Year Edition Deluxe, The
Enter the Gungeon
Epistory - Typing Chronicles
Event[0]
EVERSPACE
Expeditions: Viking
Fallen Enchantress: Legendary Heroes
Firewatch
FTL: Advanced Edition
Full Throttle Remastered
Galactic Civilizations III
Goliath
Grim Dawn
Hard West
Homeworld: Deserts of Kharak
Homeworld® Remastered Collection
Hotline Miami 2: Wrong Number
Hybrid Wars
INSIDE
J.U.L.I.A. Among the Stars
Kathy Rain
Kim
Last Door: Season 2 Collector's Edition, The
Layers of Fear
Legend of Heroes: Trails in the Sky SC, The
Legend of Heroes: Trails in the Sky the 3rd, The
Legend of Heroes: Trails in the Sky, The
Legends of Eisenwald
Little King's Story
Little Nightmares
Master of Orion
METAL SLUG
METAL SLUG 2
METAL SLUG 3
METAL SLUG X
Might and Magic® 7: For Blood and Honor®
Minecraft: Story Mode - A Telltale Game Series
Mini Metro
Moon Hunters
No Man's Sky
Offworld Trading Company
Oh...Sir!! The Insult Simulator
Outlast 2
Oxenfree
Pathologic Classic HD
Pharaonic
Pillars of Eternity
Prison Architect
Project Highrise
Rebel Galaxy
Renowned Explorers: International Society
Reservoir Dogs: Bloody Days
RiME
Rogue Wizards
Saints Row IV: Game of the Century Edition
Saints Row: Gat out of Hell
Satellite Reign
Serious Sam's Bogus Detour
Shadow Tactics: Blades of the Shogun
Shadow Warrior 2
Shadow Warrior Classic Redux
Shadwen
Sheltered
SHOCK TROOPERS
SimplePlanes
Sins of a Solar Empire®: Rebellion Ultimate Edition
Slain: Back From Hell
Sorcerer King
Sorcerer King – Rivals
Space Rogue
Star Vikings
Starpoint Gemini Warlords
Stories: The Path of Destinies
Stronghold Crusader 2
Sword of the Stars: The Pit Gold Edition
Tahira: Echoes of the Astral Empire
Tales from the Borderlands
Tempest
TerraTech
The Incredible Adventures of Van Helsing - Complete Pack
The Incredible Adventures of Van Helsing II - Complete Pack
The Incredible Adventures of Van Helsing III
The Incredible Adventures of Van Helsing: Final Cut
THE LAST BLADE
The Original Strife: Veteran Edition
The Real Texas
The Solus Project
The Walking Dead: A New Frontier
The Walking Dead: Michonne - A Telltale Miniseries
The Walking Dead: Season 2
This Is the Police
This War of Mine: Soundtrack Edition
Trine 3: The Artifacts of Power
Turok
Turok 2: Seeds of Evil
TWINKLE STAR SPRITES
Tyranny
Urban Empire
Victor Vran
War for the Overworld
Witcher 2: Assassins Of Kings, The - Enhanced Edition
Witcher 3: Wild Hunt, The
Witcher 3: Wild Hunt, The - Game of the Year Edition
Witcher Adventure Game, The
Witcher: Enhanced Edition, The
Wolf Among Us, The
Wonder Boy: The Dragon's Trap
Worms W.M.D
X Rebirth
Xanadu Next
Ziggurat
Zombie Night Terror

Thank you for your feedback folks! There are some questions popping up here in the thread so let me quickly get you some answers.

Which kind of installer is downloaded via Galaxy?
If you download a game via GOG Galaxy, you will get the classic installer. Since you're already using GOG Galaxy there's no reason for you to download the installer with the client.

Which kind of installer is downloaded via GOG Downloader?
The GOG Downloader is linked to the Classic Game Installers.

How to recognize if the installer file I'm downloading has GOG Galaxy or not?
As noted by some users, the installer files with GOG Galaxy have the (g) at the very end of the file name.

We've named the installers clearly, and the names are clearly visible on the game view in "My account". It's not our intention to hide it in a small text at the very bottom, which no one reads.
We're still working on making the super-small GOG Galaxy file, but it will take a bit more time. Will definitely let you know when it happens.
As febles22 wrote in her post, Classic Game Installers will be kept up to date, like it was done before, along the GOG Galaxy Game Installers.