Hey guys.
I've recompiled the DLL to work in 1.2. I hope that TriggerAu won't mind.
Here are the binaries for those who want to compile yourself https://www.dropbox.com/s/eppsken1913ps25/TransferWindowPlanner-1.5.1.0 for 1.2.zip
And the updated DLL https://www.dropbox.com/s/es1gwsrpavwz9p9/TransferWindowPlanner.dll (rewrite this in GameData/TriggerTech/TransferWindowPlanner)