I am looking for the highest quality recording of this masterpiece. thanks in advance.
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You need to listen to it then.

This is a new version and it is the best version I have heard on digital.

Have you heard it?
But Jafant, tell us why no download will better the physical format. Is this for KOB specifically or for everything? We want to know what you know.
Can one get the high-rez version on disc?

If not, where does one get the mono version?

I could find neither on Amazon.

The hi-rez versions are downloads. You can get the mono or stereo version at HDTracks
Mobile Fidelity has been advertising an SACD version of KOB for a couple of years now, but the release date is still To Be Announced. Only time will tell if they ever get it released.