The Missing Training report downloads directly when it is generated, but takes a little while to generate in my test account. The delay is probably longer in accounts with more training data. Suggest to move report generation to AutoTask / email delivery
This report should be removed or updated as it will produce a list of all the trainings in the library employees have not taken. It does not show you the assigned training that has not been taken but all trainings. We ran this report for an EC and produced over 15,000 trainings.