Old cache files can sometimes interfere with new add-on installations.
Language packs need free on the system drive. Also ensure your user account has write permissions to: C:\Program Files\Adobe\Adobe Premiere Pro [Version]\Dictionaries (or equivalent).
Click next to "Remove media cache files" and select Delete all media cache files from the system . Restart the software and try the download again. 4. Advanced: Edit the ServiceConfig File (Windows)