right next to the download link was/is a link to notes that best should be followed:
You could try to un-install the 64-bit version,
install the 32-bit-version in the same way you did before you switched to 64-bti,
check, whether the settings you are now missing, are still there,
save the configuration in a safe place,
un-install the 32-bit-version,
install the 64-bit-version,
restore the settings from the saved configuration.