Was able to successfully update aatrix. Still received error when logged in as domain administrator. Uninstalled aatrix, restarted workstation, removed aatrix files/folders/temp files, renamed the eFiling and Reporting Histories folders (multiple companies) and added a blank folder called Histories, installed aatrix from the workstation installer, logged into Sage 100 and selected the Activate button in AP 1099 eFiling and Reporting, manually ran the updater (MAS90.exe), logged into Sage 100, still got prompt about updating when went into 1099 eFiling and Reporting so selected the Automatic Update which successfully completed, went through the test drive which worked. Deleted the blank Histories folder and renamed the backup folder back to Histories. Yes, lots of steps, but it worked. Hope everyone else finds their solution! I agree with Jeff, seems there are multiple issues/causes.