Out of the blue and just on time for Christmas, the songs “Analyse – Christmas at the Vatican” and “Panis Angelicus – Christmas at the Vatican” both recorded live on the 15 December 2001 at the 9° Concerto di Natale in Vaticano were released as singles a few days ago, on the 24 October 2019, on almost all streaming platforms (Spotify, Deezer, Amazon Music, Google Play…)
Not available on iTunes/Apple Music (yet?)

Both songs were already released last year (26 October 2018), “Analyse” on the album “A Very Merry Christmas”

and “Panis Angelicus” on 2 different albums, “Christmas at the Vatican” and “The Perfect Christmas”.

It looks like there is no physical releases for all these singles and albums, they are only available to stream or download.

Thanks to Dan Steward for the info.

EDIT: Also available on a few platforms (Google Play for instance), the album “A Joyful Christmas” released last year on 25 October 2018 which includes the songs “Analyse” and “Little Drummer Boy” still from the same Vatican show in 2001.  “Analyse” being credited to Dolores O’Riordan and “Little Drummer Boy” to The Cranberries (!?)

…and still on a few platforms, the song “Little Drummer Boy” is available as single. It was released on the 24 October 2019 and credited to The Cranberries & Westlife (!?)