The most common issue for Acknowledgements that fail to download are due to an Antivirus program that could be blocking the program from transmitting. You will want to make sure that the program is added as an exception or exclusion to your antivirus in order to a transmission session to go through.
Another common cause of missing acknowledgements is sending/receiving from more than one PC that aren't connected to each other, like they would be in a network setup. You should only be sending from one PC, or one group of connected PCs in a network. For more information regarding network setups, please contact UltimateTax Support.
This information applies to all years of the UltimateTax software.