I have macOS Sierra installed and have an SSD and using the following command to avoid conversion to APFS
/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --converttoapfs NO
but I get the following error:
Error: could not get license agreement
Also if I add the parameter
--agreetolicense I get the error
Helper tool crashed...
Anyone having similar issue knows how to tackle that situation or my Installer is corrupt? Anyhow, I am able to run the installer and accept the agreement but that would also automatically convert my file system to APFS.