Starting with Cartograph 3.1.2 downloading of online tiles into an offline MBTiles file is supported.
Note: Due to legal reasons only manually added online maps can be used as tile sources for the download. You have to set the “enable_tile_download” flag to “true” in the JSON file when importing maps (see https://www.cartograph.eu/v3/add-ons/online-maps/#onlinemap). As an alternative you can also use the Online map creation tool.
After you have installed the online maps as described above, you can click on the online map entry in the Map manager and select “Download tiles“.
Note: The maximum number of tiles per operation is limited to 1.000.000 tiles.
The following video shows how to use the map tile downloader: