I bought the Premium version to use it with LibreOffice, by putting the URL of the remote server in the settings.
It returns way too many false positives.
For instance it returns spelling mistakes in “In other words”, “accepted”, “considered”.
It also slows down the software quite a lot.
I won’t renew it.
Could you share a document where this happens? I cannot reproduce it yet.
If you share an email address I will send the document to you.
Please send it to the support email you can find at LanguageTool - Imprint and mention this thread.