Consistently get "Setup wasn't able to create the required database tables"

GDE has never been tested in that environment, and I don’t really know much of anything about it, so I may not be able to offer much assistance here. Perhaps you can try creating the tables manually – if there are “tables” at all in the situation. The schema normally used when setting up the plugin under mysql can be found in libs/lib-setup.php in the gde_db_tables method if you’re inclined to try.