Mail Archiver's database changes with each version. The Filemaker archive needs to have the same fields. You can either import from an older version of the Filemaker archive into the newer one. This was shown in the video Import data into a new Filemaker archive. Alternatively, you can directly update your Filemaker archive. Usually, you will need to add a field or two and update scripts and formulas. Mail Archiver will show you what you need to add.
The video shows you what this will look like: