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TI SPICE reports "File is read only or used"

FL20250929850

I am using TI SPICE and try to run a simulation which works for the initial downloaded TI package (TL431). I can start the simulation as it it was provided by TI download.

But I can not save or change the simulation profile or schematic: Message is following

- tran is read only: can not update

- schematic is read only

In general it seems that the whole project is read only. 

How can I change it from read only to editable?

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