Mike,
Welcome to the forum. Always a pleasure to have another Melkite among us.
There is one used copy listed on Amazon's French site -
here [amazon.fr] - but this appears to be only vol. 2 (the Divine Office) of the 3 vol. set.
The rubrics in the current Horologian offered by the Eparchy of Newton are principally drawn from a translation of Father Courtier's work by Bishop Nicholas.
Other than the incomplete set at Amazon, nothing to be found on-line. There are only a few libraries that list it as among their holdings - all of those (3 or 4, I believe) are in France.
Many years,
Neil