The cbs_list.csv is stored on the local computer under C:\ProgramData\Common Files\Trimble\Config.
If the customer is blocked from access to the FTP, and IT won't set permission to allow it through, it's also hosted here https://downloads.trimblegeospatial.com/CBSList/cbs_list.csv. The user will need to manually download the file from the https site and place it into the file directory above.