@Tstull and @Erikbeeren ,
No, this is because, if you want to use OpenStudio 3.0.1 with the legacy plugin, you have to follow this one step here:
Alternatively, if you want to leave your legacy using an older OpenStudio but ensure that the new LBT plugin is using OpenStudio 3.0, you can install OpenStudio 3.0 in your C:\Users\[USERNAME]\ladybug_tools
folder as is recommended in the installation instructions. The Legacy plugin won’t know to look in the ladybug_tools
folder but the new LBT plugin will find OpenStudio at that location.