You may notice that both in the Prelude and Offertory I play the shortened version of the pieces (a couple of people asked me questions about that).
You see, I first performed this Mass in 2012 during a recital of my organ compositions at Vilnius University St. John's church and had to play a slightly shortened version of the Mass because otherwise my recital would have ended up a bit too long.
Now, with this Offertory, you will have 3 pieces (Prelude, Offertory, and a Communion which I shared earlier) out of 4 parts in this cycle. The remaining Postlude was originally written later than the earlier 3 parts and is still in my hand-writing.
If it would be helpful for you to have all 4 parts of this cycle in a PDF, just let me know and I will try to complete the transcription of this Postlude with my Sibelius software as well.