By default, Source Control for Oracle creates the WorkingBases and Transients (along with other associated files and folders) in the users Windows profile (C:\Users<user name>\AppData\Local\Red Gate\Source Control for Oracle).

In some environments the C: drive is configured to be minimal size (just OS and some required applications).

Being able to configure the paths where the WorkingBases and Transients (along with other associated files and folders) would to free up disk space in environments where the C:\ is configured to minimal disk space.