Please note that there is an error in the Easter Sunday edition of the Simple English Propers (Introit, Resurrexi) that was previously released. Verses from Psalm 138 were given instead of Psalm 139, the correct psalm for the Easter Day Introit.
This error has been corrected and the updated version of the score can be downloaded here. If you previously downloaded this score please update to the most recent version. My apologies for the mistake.