S. Krezel - Dynamic Tree & Plant Generator

Merry Christmas Slavq! I’m having an issue when using FORMS. I am attempting to make one of my own and from the way I understand to do so is drag one into the editior and then select the top spline handle, hit alt to grab and slide it around. However when I hit alt it crashes UE4 for me. Is this an issue with Dynamic Tree and Plant or with my UE4 version. I am using 4.14.1 Thanks

Edited for more; I just noticed that it crashes when I select a TreePreset and drag it into the editor (duplicating BP has same outcome) When I hit the ‘x’ in the editor for clear path so I can start tweaking some settings it crashes as well.