These are MapsBank topo maps from the defunct Mapsbank site.
There are 3 maps for Australia, and 53 maps for the individual U.S. states, territories, etc.
There is no password required or text message to be sent to a fake TPB site to be able to access these maps.
All maps are individually downloadable if you do not want all of them.
They are compatible with Garmin BaseCamp and uploadable to Garmin GPS's from BaseCamp.
Each map is in an EXE file.
Install the ones you want.
They will show up in BaseCamp's drop down map list.