Hi @TIITG ,
Welcome to Q&A forum!
I successfully installed German, Spanish, Italian and French proofing tools for 64-bit Office 2019 by using the following configuration .xml file, please check it.
<Configuration>
<Add OfficeClientEdition="64">
<Product ID="ProofingTools">
<Language ID="fr-fr" />
<Language ID="de-de" />
<Language ID="it-it" />
<Language ID="es-es" />
</Product>
</Add>
</Configuration>
Besides, if you want to install other languages or Proofing tools later, you can create the corresponding xml files through the Office Customization Tool (OCT).
For reference:Overview of the Office Customization Tool.
Hope the inforamtion is helpful to you.
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