The latest version of the “old” Encore is 5.0.4.875 for the Windows platform.
However, this version is no longer officially available for purchase. You may still be able to get a copy from this vendor: https://www.musica.at/software/sequenz/encore.htm
If you already have a license key, you can also send me an email at hofmann.mario(at)arcor.de, and I’ll send you a download link for the Encore Windows Installer.
Or you can contact Andre Baeck at andre.baeck(at)gmail.com.