Thank you for your quick responses, Lyndel and 2Many. I finally got the software to work. I did try what you suggested in addition to the following:

Reinstall, and when it hung up at a certain point, I ended the Prontoedit database service via Task Manager, as suggested in someone's post in 2010. It is now possible to edit as needed and download to the remote. Only two issues appear to remain:

1. with remote connected it is not possible to test codes using the Test button. It is necessary to download the configuration into the remote and test from there. A little tedious while making and testing changes.
2. learning does work, but NOT from the remote that came with my new Sony A95K TV. Would it best for me to start a new thread on this?

Thanks very much for your help in getting PEP 2 to work again!
Ed