WP <5.0 Mappress auf einer anderen Domain

Laut Handbuch

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Backing Up and Copying MapPress Data
MapPress stores all of its data in two tables: mappress_maps and mappress_posts. Options are stored in the standard WordPress options table.

The MapPress tables will normally be included if you’re backing up your entire WordPress database, or you can export them using MySQL.

If you copy your blog from one place to another you will also need to copy the MapPress tables. If for some reason you renumber of change your post IDs you will also need to update the mappress_posts table with the new post IDs.

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https://mappresspro.com/mappress-documentation/

Mit dem MyOOS Dumper aus meinem Projekt könntest du evtl. kopieren...

https://github.com/r23/MyOOS/
einfach das mod Verzeichnis auf den Server kopieren und eben installieren...