My company refreshed (updated) my computer a week or so ago, and I attempted to reload PDF-XChange Viewer PRO from the website. It went fine, and I entered the Keycode that I obtained via an email from Dec 2012. I thought everything went well, but when I went to digitally sign a pdf document, I was informed that this function is only available in the "PRO" version. Gee, I thought I was using the PRO version that I paid for in Dec 2012. This stuff is so complicated. Do you guys have a "Jitterbug" version of PDF-XChange Viewer PRO available?