It's a disgrace that one cannot easily gain access to the score of one of Zelenka's masterpieces. I went to a few sheet music stores in Europe and was always given an offer of trying to order a score for a few hundred Euros, but no guarantee (i.e., I'd have to wait and see if it's even possible at all.) The options I found myself online suggested I can try to 'rent' performance material, for an undisclosed price. Any sensible person will refuse to participate in such a nonsensical practice.
The manuscript has been made freely available. The project is, then, to prepare an open access score of the Missa Omnium Sanctorum. I have no illusions I'll be able to complete the project in a reasonable amount of time, since I'm just a hobbyist who is also preparing scores of other composers for choral performances. (And it's all but guaranteed the amateur choir I'm in will never attempt anything like the M.O.S.) But perhaps some parts of the Missa can be useful for someone.
I will be using Lilypond. If any fellow Zelenka typesetters would like to help, please post in this thread! (I want to typeset Kyrie 2 and the Credo next, so I'm calling dibs on that.)
So, without further ado, here's Kyrie eleison 1 from the Missa Omnium Sanctorum: https://www.dropbox.com/s/hzfzgss2r3t6e7i/01_Kyrie1.pdf?dl=0