The Longest Journey HD is a mod for one of the best adventure games ever made. It includes neural network upscaled backgrounds and sprites, redrawn user interface and a lot of other small improvements thanks to ResidualVM implementation of the game engine. You can play it on Windows, Linux and macOS.
Installation instructions
TLJHD.zip to the game installation directory. If asked, overwrite all existing files. Make sure that the path to the mod looks like this: The Longest Journey\mods\TLJHD\. You can also download a pack of upscaled in-game videos — extract them to the game directory as well.Add game... and choose the game (not the mod!) directory.Graphics tab select Override global graphic settings and Fullscreen mode. Click OK.Options (not Edit game, or it won't work) and select the level of Anti-aliasing in a drop-down list. From my experience 4x is more than enough.Start to launch the game. Ignore the popup message and click Start anyway.ResidualVM supports keyboard shortcuts for different in-game actions.
You can view the full list on the official GitHub page.