Mittenwaldbahn Quickdrive Fix

After downloading open the Zip and extract the 8f4f3101-1569-44ed-94fb-b91473c295a0 to a temporary location like "Downloads"
Open the MainContent.AP in the \RailWorks\Content\Routes\00000073-0000-0000-0000-000000002017 folder with 7Zip or Winrar

Open the Scenarios folder and look for the 8f4f3101-1569-44ed-94fb-b91473c295a0 folder.
Delete the folder by right click on it and select delete.
Copy & Paste the 8f4f3101-1569-44ed-94fb-b91473c295a0 folder from your temporary location in the MainContent.AP folder.
It replaces the original scenario and all northbound Quickdrives are not blocked anymore.