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upgrade kit = both sides
I though the upgrade kit added the second crank when you already had the single-sided thing. On the shop page it says "Kurbelarme und Kettenblätter sind nicht im Lieferumfang enthalten !", which google (and even a basic understanding of European languages) translates to "Crank arms and chainrings are not included !"
gbj_tester-
That's what I was wondering about. My German is just about adequate to translate 'Kurbelarme und Kettenblätter sind nicht im Lieferumfang enthalten' but presumably the same would be true for a 'fit this L/H power meter to your cranks' kit as it would be for a 'make your single-sided power meter double-sided', so that doesn't really answer the question.
Not that I don't trust you, @amey, but have you got any citation to support that assertion?
Brommers
upgrade kit = both sides