What you can do is import the layout directly into the SiteAssist folder instead of using the preset manager. To do this you would unzip the MidnightOasis_Layout.zip. In the unzipped folder, you will see 2 files and a folder. Copy the MidnightOasis.xml and the folder to this location:
/Configuration/Shared/WebAssist/SiteAssistPro/layouts/
The configuration folder location is specified in a previous post I made.