That the music of Höpner was quite popular among organists in his days is shown by the fact that his compositions were published in several collections and in music journals. Several of these collections anbd music journals are available as digital copies online. So even though the original publications of Höpner's opuses, with the exception of his opus 2, is not available online, individual compositions from his opuses are still available to me.
One of these compositions is Höpner's prelude to "Wir Christenleut", from his "11 Orgelstücke", opus 15. It was republished in the third volume of "Der praktiswche Organist". It is a beautiful, evocative compositions, playable on two manuals, but even better played on three manuals. As it is such a beautiful piece, I wanted to play and publish it now, instead of wating till somewhere next year when I'm finished with pubishing Höpner's opus 2.
The recording was done with the Hauptwerk software and the sampleset, made by Voxus, of the Müller organ in the Sint Bavokerk, Haarlem (http://www.voxusorgans.com/en/product/haarlem).
Score available here: https://partitura.org/index.php/christian-gottlob-hopner-wir-christenleut
If you like what I do, you can buy me a coffee: https://www.buymeacoffee.com/partitura