Sorry to reply you late due to some circumstances.
Is this issue resolved?
Do you mean this exmaple https://optics.ansys.com/hc/en-us/articles/360042329094-Ring-modulator-time-domain-INTERCONNECT-
All the files are for INTERCONNECT. no simulation needs FDTD.
Please reboot your computer, and check the license as well as products included. Please let me know if the problem still exisits.
You are navigating away from the AIS Discovery experience