MapSource usually requires a pre-existing Garmin map product to be installed on your PC. If you are starting fresh:

: Inside the extracted folder, locate and run the MAIN.msi file first. This configures the Windows Registry keys required by Garmin apps.

Unofficial "special" bundles often contain modified installers that can carry malware, adware, or viruses. Always scan downloaded files with updated antivirus software.

Legacy map data will not reflect new roads, altered trail paths, or updated points of interest.

Are you setting up your mapping software for an upcoming trip, or are you trying to revive an older Garmin GPS unit? If you let me know:

Use or GMapTool to convert newer .gmap folder formats into the legacy registry format.

Allows full-screen selection of map "tiles" for transfer to GPS units, which many users find more intuitive than the newer Garmin BaseCamp interface. How to Install the "Full" Version

In essence, the “Garmin MapSource 6137 Special Full Top Version” is a community-made, standalone installation package of MapSource 6.13.7 that includes all the features of the official software, often with added flexibility for map management and without the requirement of a prior CD-based installation.