Bought TDS3 a while ago. Not using for more than 1 year, I thought I wanted to take another look at it. Here the problem started. Appreciate your help and advices. I requested a new tds3.kf my emailing at firstname.lastname@example.org, and I today received a new tds3.kf from DCS, but the received tds3.kf file was rejected by TDS3 trial upon a Windows reboot. After this, whenever click on the TDS program shorcut, the program refuses to initiate with following message. And tds3.kf has been renamed to tds3.kf file.BAD in the TDS directory. I am unsure about what other file names have been modified due to the bad tds3.kf. Can anyone kindly confirm what else have been modified within the TDS directory? Is the installed program is still usable with another good tds3.kf from DCS? I hate to see it turns into another huge project. Got lots thigns to take care of at work. "Illegal/Blocked Keyfile The keyfile you are using has been blocked or is illegal. Please contact email@example.com and attach your ketfile and proof of purchase if you believe this is error." I followed closely the official intructions when installing the latest version TDS3 and appying the key file and updates. In particular, before the system reboot, I manually copied the followings into the TDS directory. 1. tds3.kf 2. radius.td3 3. update.cfg Appreciate your advices.