As we announced earlier this month, the Dolet® for Sibelius plug-in for exporting MusicXML 4.0 files from Sibelius Ultimate is now open source. Today we have made the source code publicly available on a GitHub repository at:
The repository includes the code history from version 8.0 onwards, including the individual changes made for version 8.2. It is also set up with GitHub Issues and Discussions to help facilitate open source development.
Note that while MakeMusic provides this repository for the convenience of open source developers, it does not maintain or support the plug-in.
We hope that making this repository available will help extend the usefulness of this alternative method for exporting MusicXML files from Sibelius Ultimate.