Quests is available and ready to be run on Spigot, Bukkit, and CraftBukkit servers. In regards to versions, Quests is compatible for versions 1.9 through to 1.16.3 currently.
What plugins is Quests compatible with?
Quests has been designed to be compatible with as many other plugins as possible. In saying this, we are unable to guarantee that all plugins will work seamlessly. If there are conflicts, contact support and we will see if anything can be done to resolve the issue.
Why has my NPC skin not loaded?
For various reasons, sometimes the skin won't register when loading the plugin. To fix this issue, make sure there is a valid uuid of the skin in the config.yml file and afterwards, run the command "/merchant reload"