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In Lumerical FDTD, how do I retrieve my simulation file when my license is disconnected or my computer goes to sleep?

You can avoid this issue by selecting FDTD-Edit Object----Advanced option -- check the box on check point option before you begin a simulation. After that, enter the interval time you wish to save your results.  We select 2 minutes here.

Fig1-Oct-17-2022-09-42-13-02-PM

Select resume as shown in this picture if you want to start from the previous simulation time.

Fig1-1