If modern five-line notation is OK with you, music for two of the four versions is provided on ICEL's web site: http://www.icelweb.org/musicfolder/openmusic.php (scroll down to "The Lord's Prayer").
I'm not a fan of the ICEL versions. In my opinion, the AECL Chant tone, first published in the 1950s and still used today in Australia is a far better version.
Here is a modern notation version which I have previously uploaded:
I have a chant notation version with the doxology (again, we have our own chant tone for it in Australia), which I'll upload when I've dug it up out of the depths of the files of liturgy booklets I've made over the years.
The one in the back of The Hymnal 1940 (no. 722) is the most faithful of all to the most common Gregorian version... all you need do is insert the embolism and make any appropriate verbal alterations to the doxology.
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