istopmotion 3.6 trial / demo version can't export

Hi Istopmotion team, I am testing out istopmotion demo version but when exporting, the file export bar appeared and seems to be finishing the export. However, when I go to the selected folder for the file to be exported, I can’t see the file. It seems that the export has failed. I tried this a few times, and same result each time. Is is because the demo version doesn’t allow export? Please advise. Thanks!