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Hi

I think you are loading only ".sav" file and trying to run NEVA.

Load both .sav and .dyr files. Then the option is enabled and you can perform eigenvalue analysis.

There could be two things then. 1.Check if your file has errors. This will be reflected in progress window. (one of my 2 terminal dc model was wrong, there neva could not launch.) 2.Check if installation is correct. Try opening neva directly using icon in programs.

Also try savnw.sav and .dyr files from example folder in psse installation for NEVA analysis