If you urgently need the full official text, can I highly recommend you to pay a visit to the "Hypertext Book of Hours" by Glenn Gunhouse.
It contains a complete transcription of a book of hours for the use of Rome, with translation into English from the Primer 1599.
A more special version is found here in my own transcript of the
Poenitentiarium Copenhagen KB NkS 50h 8vo, where the text of the penitential psalms is translated into medieval French, and each verse accompanied by a prayer in French (Hainaut c.1490).