If a site asks you to download a "special installer" just to get the zip file, it is likely bundled with adware. How to Use Portable Basemap Server Once you have downloaded and extracted the zip file: Run the Executable: Open PortableBasemapServer.exe .

Copy that URL into ArcMap, ArcGIS Pro, or QGIS as a new WMTS or ArcGIS Server connection. You can now use your basemap with zero latency.

Ability to convert MBTiles to other formats or serve them directly.

Look for reputable GIS community forums or GitHub repositories.

A legitimate zip file for PBS V3.1 is typically small (usually under 10MB), as it is a streamlined utility.