How to Download Free XYZ MapTiles BMP OR JPG Image

You are misunderstanding the meaning of "free" in OpenStreetMap. As the Tile Usage policy (https://operations.osmfoundation.org/policies/tiles/) clearly states:

"OpenStreetMap data is free for everyone to use. Our tile servers are not."

And about bulk downloading it states:

"Bulk downloading is strongly discouraged. Do not download tiles unnecessarily. In particular, downloading an area of over 250 tiles at zoom level 13 or higher for offline or later usage is forbidden."

So your options are to either:

a) render the tiles yourself. A guide for doing so can be found for various OS at https://www.switch2osm.org/serving-tiles/. You would want to use the data for Singapore (e.g. from here: https://download.geofabrik.de/asia/malaysia-singapore-brunei.html as kindly provided by Geofabrik).

b) find a tile provider to serve your needs. E.g. Geofabrik offers tile packages with PNG tiles (see: https://www.geofabrik.de/en/maps/tile-packages.html ) or you may download PNG tiles with e.g. SAS.Planet from https://rapidapi.com/MapTilesApi/api/offline-maptiles/ . You'll need about 50000 tiles for Singapore in zoom 6-17. Other providers (see a list at e.g. https://www.switch2osm.org/providers/ ) may also offer tiles for download/offline use or tile packages.

It will be even harder (and for easiest ways more expensive) to obtain satellite images for Singapore. Either you'll have to look into the offerings by companies like e.g. Maxar (as an example for a satellite data company) or e.g. MapTiler (https://data.maptiler.com/downloads/tileset/satellite/asia/malaysia-singapore-brunei/).

Or you can try to get satellite images produced by e.g. Sentinel-2 (see https://earthdata.nasa.gov/ but please check their licenses) but the resolution might not be good enough for your up to zoom 17 plans.