You can either click on the desired region on the map or on its entry in the table. After downloading then running the file, it will create the San Francisco Bay Area Zone if it doesn't exist and install the selected region.

SAN FRANCISCO BAY AREA ZONE

San Francisco Bay Area Zone
Region	Windows Setup	Source
Peninsula Half Moon Bay to Santa Cruz	setup_peninsula.exe (9.0 mb)	peninsula.zip (8.8 mb)
Delta Rio Vista to Patterson	setup_delta.exe (7.7 mb)	delta.zip (7.4 mb)
East Bay Richmond to Livermore	setup_eastbay.exe (9.1 mb)	eastbay.zip (8.9 mb)
Marin Tomales to the Golden Gate Bridge	setup_marin.exe (8.5 mb)	marin.zip (8.3 mb)
North Bay Rio Vista to San Rafael	setup_northbay.exe (6.3 mb)	northbay.zip (6.0 mb)
San Francisco San Francisco to Half Moon Bay	setup_sanfrancisco.exe (5.3 mb)	sanfrancisco.zip (5.1 mb)
South Bay Fremont to Gilroy	setup_southbay.exe (11.2 mb)	southbay.zip (11.0 mb)