On Windows you should run your cmd.exe or Powershell in Administrator Mode, then run BRAW Studio installer executable with the /S argument, for example in Powershell : ./"BRAW Studio v2.1.2 Installer.exe" /S if you're in the extracted folder from the downloaded zip.
WARNING : if you have Blackmagic RAW Adobe plugins installed, it will uninstall them without asking you for confirmation (since there is no GUI here) and will redirect you to a webpage explaining the incompatibility between the two plugins.
Same goes for the uninstaller but you'll also need to specify the -Uninstall_BRAW_Studio argument.
If you want to be sure that the installer / uninstaller exit automatically without user confirmation you should run the .exe like this instead start "Autokroma" /wait /b "PathToInstallerOrUninstaller.exe" /S

If you also need a command line installer for macOS, please contact us and tell us !