RoboHelp (2019 release)

You say:

Word 2013ではできていたことが、Word 2019ではできなそうでした。

To confirm the meaning:

Previously, you used Word2013 and you were performing a specific task.

Now, you are using Word2019 and you can no longer perform the specific task.

(I apologise. I don't speak Japanese, and Google Translate is not always correct.)

Is this correct?

What are you trying to do? Perhaps we can think of some ideas.

RoboHelp 2019 New UI does not require Word installed for either importing or exporting. The requirement is the file is in DOCX format when importing. 2019 New UI generates a DOCX file but it does not require any version of Word to be installed.

You would need to contact Adobe to confirm if Word 2019 is supported. I can only find a page that lists Word 2016, 2013 and 2010.

You could also install the Robohelp trial version and see if it works. I would recommend using a test computer, not your production computer.

To downgrade the Word version to 2016, I think you would need to talk to your IT support staff. Depending on your license, you might be able to run both.

https://support.office.com/en-us/article/install-and-use-different-versions-of-office-on-the-same-pc-6ebb44ce-18a3-43f9-a187-b78c513788bf