It is interesting - it will compile for some 18F series, but not for others.

For example, it will compile for 18F1220, but not for 18F1320, but will for 18F1520
It will compile for 18F2439 but not for 18F2550.
It will compile for 18F24K50, but won't compile for 18F24K22.

For testing purposes, I took my daughters laptop, where no PBP was ever installed, downloaded the trial version and it is absolutely the same...