If you are currently running Oracle 126.96.36.199 (either Standard or Enterprise) in a production environment, you might want to look at upgrading it to Oracle 10g Database. I have not found any material that indicates that you can upgrade from release 188.8.131.52 to Express Edition. Also, remember that XE "will store up to 4GB of user data, use up to 1GB of memory, and use one CPU on the host machine" so this will limit what you can do with it.
Having said that, you might be able to export the schemas in your Oracle9i database and import them into Oracle 10g Database Express Edition. Also, with your download you can register for the Oracle 10g Express discussion form on OTN.
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