I tried this simple install, and it worked beautifully.
Formatting, with regard to words spacing and hyphens, seems to work better than Nickel.
One annoying thing, tho, is that any change to font, margins, spacing or anything take quite a long time to apply, especially on long book. It looks like it's recalculating the whole book formatting. Is there a way to limit this ? Maybe by recalculating only chapter or something ?