For some reason, it stated that the software was locked because the current date on my computer has been set to a date prior to the date that I unlocked the software. I had no idea what happened since I didn't do such thing. I tried to manually unlock it but it doesn't work. I got the unlock code from online at scholarware.com but the software said that it's an invalid unlock code. It's not in business hrs time frame now and I need to get my RC practice 🙁