Sorry to hear you are having issues.
First, please update your ODM to the latest version. And if you did that already, please check if you have ODM to also list out all the available beta for download.
To do that Click on ODM Cogwheel ->Setting->Object Desktop Option-> Tick the "Shows beta downloads" -> Click apply.
Wait for the ODM to refresh. Curtains should appear.
If it don't need to turn off ODM and restart.
To turn off ODM, go to taskbar tray. Right click on ODM icon -> Exit Object Desktop.
Try that and let us know if you still need our assistance.
Stardock Community Assistant.