I removed the SCT Device Updater, and reinstalled it. Now, the shortcut icon will ask 'do you want to allow the following program to make changes to this computer?" when clicked. If I click yes or no , the box goes away and nothing happens.
SCT tech support couldn't figure it out, but with some time and searching, I was able to figure out which of the security settings were blocking the completion of files downloading. Backed off those settings in the computer and everything worked perfectly. Base tune in, datalogging complete. So far, so good. Now for the fine- tuning. Thanks, Tom. The base tune is already a smooth improvement.