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Note: Future versions like 1.19 will work on all of the above due to how the plugin is built. (Excluding issues where noted)
You may also use ViaBackwards for backwards 1.9-1.16 support on the above servers and ViaRewind will allow 1.8/1.7.
Bukkit / Spigot Compatibility Issues
If you wish to use ProtocolSupport, for 1.8.8 servers use build 388. Otherwise try the according build, late-bind may not function properly when using ProtocolSupport + ViaVersion. ViaRewind may also be a alternative solution to ProtocolSupport.
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You can download the latest release from the top of of https://wwwhangar.spigotmcpapermc.orgio/resources/viaversion.19254/updatesViaVersion/ViaVersion, download this to your plugin folder.
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If you believe the issue is a bug, and not a configuration issue report it here on GitHub.
For support, (EU times mostly) you can use our Discord server.