Unlike past revisions of the Sunday Celebrations in the Absence of a Priest ritual book, the current revisions do not change the elements of the rite in any way, but only concern themselves with modifying certain texts to fit with the new English translation of the Roman Missal. (And with your spirit, the Nicene Creed, Behold, the Lamb of God…, O Lord, I am not worthy that you should…)
If you have a 2007 bi-lingual edition of the SCAP book (the thick, green one), and don’t use the Morning Prayer Evening Prayer options, you don’t necessarily have to buy a new book in order to have the crucial texts updated—as long as you tape-in the page corrections which you received from the diocese in spring of 2012.
Besides Morning Prayer/Evening Prayer, the other elements these correction pages don’t update are the Prayers of the Day—which aren’t used as the Opening Prayers like they are at Mass, but are only options for ending the Prayers of the Faithful. (Since these are only optional texts, I figured the former translation wouldn’t necessarily preclude their use in that instance.)
If you have SCAP ritual books which are older than 2007, please toss them. Basic things were changed about the ritual in 2007, making the older books 100% obsolete.
SCAP ritual books are not for weekday communion services. The ritual book for use on weekdays is the very old but still correct 1974 Holy Communion and Worship of the Eucharist Outside Mass (from Catholic Book.)