The last paragraph in the Install section feels like it should be two with a line break between "upgrading from Includes" and "second noble phantasm." I'd put the upgrading line in right after the one that says you can't Install if the Include is unavailable since it's weird to have the Include phantasm round cost reminder in between them.
Spoiler: words
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"When a servant soul installs a heroic spirit, she includes that servant’s weapon for free, gaining access to the include’s noble phantasm. The include, and the weapon, will last as long as the install. Because of this, a Servant Soul may not install a heroic spirit whose weapon she cannot include (due to having included it too recently), even if she has not yet installed it that day. However, a servant soul may upgrade an include to an install while in the middle of the include. If doing this, activating the install takes the normal amount of time, and the install will last for the number of rounds remaining in the include (even if her constitution increased), and doing this still counts as a use of install.
Using the include’s noble phantasm in the install will reduce the duration by the specified number of rounds. In addition, a servant installing gains access to a new noble phantasm for each class. Using these noble phantasms will reduce the duration of the Install, just as the other noble phantasms do. As with other noble phantasms, if not enough rounds are left in the Install, the phantasm will conclude and terminate the install. Unless otherwise noted, all phantasms are full-round actions. Unless otherwise specified, any noble phantasm with a save DC uses the DC 10 + 1/2 the user’s class level + the user’s constitution modifier. Almost all noble phantasms are supernatural abilities."
"A Servant Soul who changes her alignment by one step has half a chance to lose favor with a Heroic Spirits she’s bonded," Half a chance, heh. I don't think anyone would misunderstand but it's kinda funny. And Devoted Soul, wow that is some devotion. I suppose there are some spirits that you could effectively spam that hard. I've said before that I'd never give up so much versatility but it's fascinating how you could basically make your build "pretending to be this one epic guy's build."