Dialogic 2.0 is a major rewrite of the plugin including many compatibility-breaking changes. It is currently developed exclusively for Godot 4.
If you are looking for the Godot 3.5 version you can find it here: https://github.com/coppolaemilio/dialogic/tree/dialogic-1
To install a Dialogic, download it as a ZIP archive. All releases are listed here: releases. Then extract the ZIP archive and move the addons/ folder it contains into your project folder. Then, enable the plugin in project settings. If you see errors in the output panel, you might need to reboot the editor after enabling Dialogic for the first time.
If you want to know more about installing plugins you can read the Godot docs page.
Made by Emilio Coppola and Jowan-Spooner.
Contributors: zaknafean, thebardsrc, and more!.
Special thanks: Arnaud, AnidemDex, ellogwen, Tim Krief, Toen, Òscar, Francisco Presencia, M7mdKady14.