heyo. i’ve no idea, it works there as far as i am told.
for one, privileges are part of the user running the program, and not anyhow related to the addon. for other, in practice that error usually means trying to execute a wrong file. you can try providing own path to aseprite’s .app file in settings.
anyway you can just launch aseprite normally, press “file > sync” there, and “connect” in blender. same results.