Your comments

Commented out.
Assets/Ludiq/Ludiq.Core/Editor/Threading/BackgroundWorker.cs
Assets/Ludiq/Ludiq.Core/Editor/Tasks/Runners/BackgroundTaskRunner.cs

/*
AsyncProgressBarType = typeof(EditorWindow).Assembly.GetType("UnityEditor.AsyncProgressBar", true);
AsyncProgressBar_Display = AsyncProgressBarType.GetMethod("Display", BindingFlags.Static | BindingFlags.Public);
AsyncProgressBar_Clear = AsyncProgressBarType.GetMethod("Clear", BindingFlags.Static | BindingFlags.Public);

if (AsyncProgressBar_Display == null)
{
throw new MissingMemberException(AsyncProgressBarType.FullName, "Display");
}

if (AsyncProgressBar_Clear == null)
{
throw new MissingMemberException(AsyncProgressBarType.FullName, "Clear");
}
*/


And also commented out where using AsyncProgressBar_Display and AsyncProgressBar_Clear.

But, get errors elsewhere too.
I'm waiting for an official update.