You highlight the completed assessments, but find that the Open button is grayed out. This happens if the Completed Assessments file gets unzipped. This would happen if you wanted to be sure you had the right file and unzipped it to find out.

To fix this problem, look to see if the zipped Completed Assessments is still there. If not, zip the Completed Assessments folder: (for Windows) right-click on the folder, choose “Send to:” then “Compress“; (for Mac) right-click on the folder and choose “Compress“. You should then be able to Import the Completed Assessments zipped file.