ESP file not overriding ESM master file

[NNS10]

I use the SPERG perk mod. It contains an esm file and a esp file.

 

I tried editing the esp file with new changes, but the changes are not occurring in-game. Even the most basic change of modifying the perk text description was not visible in-game.

 

What am I doing wrong? I'd try editing the esm file if I could, but the CreationKit doesn't seem to allow saving esm files (?).

[NNS10]

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