download: https://soblex.de/spellchecker_extension_update/soblex_hsb_webext_w6_3.03.08_06.02.2021.xpi
How can I install and use the Upper Sorbian spell checker in LibreOffice?
- Open a browser and go to www.soblex.de.
- Click on the burger menu in the upper right corner -> Downloads.
- 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.