download: https://soblex.de/download/download.html
How can I install and use the Upper Sorbian spell checker in LibreOffice for Apple macOS?
- Open a browser and go to www.soblex.de.

- Click on the burger menu in the upper right corner ->> Download.

- Under the heading “za/for LibreOffice/OpenOffice” you will find in the second paragraph a link to the extension. Download it.
- Execute the downloaded file (soblex_hsb_w6_3.03.08_06.02.2021_sc_th_hy.oxt), e.g. with a double click.

- Confirm the installation in LibreOffice and restart LibreOffice.
- Now you can select Upper Sorbian as the language for spell checking and documents in LibreOffice.