Thank you for using Syncfusion products.
DocIO supports various languages, for the list of languages supported by DocIO, please find the below reference link for the list of Language localeID supported in DocIO.
We have prepared a sample to show you support of various languages in DocIO. Please find the attachment for the sample.
Please let us know if you have any questions.
Thank you for your update.
Yes, DocIO supports multi language while parsing from a file also. Please find the attachment illustrating the cloning of contents present document to a new document.
Regarding the version, it is not necessary to have updated to the latest version for the use of multi-languages using DocIO.
Please let me know if you have any questions.