Hi Scott
Yes, I have tried to reinstall the evaluation version. That is why I am saying that I have lost two chances of installing the evaluation version. Both times the same error message pops up.
I have been using an older version of the software earlier. Some time back, I have installed the evaluation version of optiFDTD and made some design files.
But now when I installed the evaluation version for second and third time, the above attached error message is there.