eisberg77: GoG doesn't have separate forums for each game in a series. So this forum is for Bard's Tale Trilogy, Bard's Tale 2004 ARPG game, and Bard's Tale IV.
That's not true. There are plenty of examples of split forums:
8-bit Armies / 8-bit Hordes / 8-bit Invaders
Alone in the Dark Trilogy / Alone in the Dark: New Nightmare
Call of Cthulu: Dark Corners of the Earth / Prisoners of Ice / Shadow of the Comet
Cossacks I & II / Cossacks III
Halcyon 6 Lightspeed / Halcyon 6 Starbase Commander
Holy Potatoes! A Weapon Shop / Holy Potatoes! We're in Space
Homeworld Remastered / Homeworld: Deserts of Kharak
Leasure Suit Larry / Leisure Suit Larry Wet Dreams
Master of Orion / Master of Orion Conquer the Stars
Pajama Sam Vol 1 / Pajama Sam Vol 2
Planescape Torment / Planescape Torment Enhanced Edition
Serious Sam / Serious Sam's Bogus Detour
Space Rogue / Space Rogue Classic
Steamworld Dig / Steamworld Dig 2 / Steamworld Heist
Sunless Sea / Sunless Skies
Sword of the Stars / Sword of the Stars: The Pit
Legend of Heroes: Trails in the Sky / Legend of Heroes: Trails of Cold Steel
The Witcher / The Witcher 2 / The Witcher 3
Theme Park / Theme Hospital
Victory at Sea / Victory at Sea: Pacific
Warhammer (6 separate forums)
X-COM / X-COM Enemy Unknown
There may be more...