NHF – new heroes for Heroes V 3.1.

less than the castle level

I read everything in detail. At first, I messed up – the level of the town was higher... but then I went to a town where the level was lower than the hero's, and nothing happened. I click, and it doesn't transform.
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Added after 9 minutes

Are you pressing the transformation spell and nothing happens?

Yes, nothing...
It just clicks, a second passes, and nothing happens.