The plugin will not run in Rosetta. I purposely restricted this because the Photoshop Select Subject tool itself doesn’t work correctly in Rosetta. Therefore, none of the Pixnub plugins that use Select Subject tool will run correctly in Rosetta.
With Photoshop running in Rosetta, open images of people and run Select > Subject in the Photoshop menu. You will see that sthe selections are wildly inaccurate. I reported this to Adobe but Adobe never fixed it. Since Rosetta is temporary, my guess is that Adobe doesn’t plan to fix this in Rosetta.
Anyway, Image Extract should run fine in Native mode. Did you install the latest release 4.0.5? I’m wondering if you installed an older version?