I downloaded and installed the trial version of TDS-3 - worked fine! - and bought it yesterday... After receiving and copying the keyfile into the TDS-folder all that works was an error-message that says: "blocked keyfile, contact technical support...". I already sent my received keyfile to the technical support center... So far I didn't get any response that means I had plenty of time to play around... I deinstalled TDS, cleaned the system (incl. registry), reinstalled TDS-trial (without the keyfile), run the program after restarting and got the same message - without any keyfile?! That's it - I've no more ideas...
Welcome to the forum Tom, glad it's fixed! Congratulations with your TDS. one of the best buys you made since long time, happy discovery!