welcome to xda.
An alternative may be to update your galaxy s to frodo (Android 2.3) using Samsung Kies Software,
and after this follow the offical guide by the cyanogen mod team, you can find it there: wiki.cyanogenmod.org/w/Install_CM_for_galaxysmtd
Through strazdas007 has recommended you to use cm11 nightly version, i would rather stick with the M versions, at the downloads they're called snapshot version! This are tested builds in contrast to the daily releasing nighlty builds.
You can find all downloads here download.cyanogenmod.org/?device=galaxysmtd