Hi, I patched the last release of this plugin and I managed to make it work in Moodle 3.2 (with developer warnings that it was using deprecated code, but it works). I publish the source code at https://github.com/juaneladio/gradeexport_xlsgd but feel free to hack it and test it in other Moodle versions.
The plugin needs to be refactored in order to apply changes made in Moodle exports in version 2.8 (MDL-46548).
General plugins
Grades Exports: XLS with Groups and Dates plugin
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