Apple provides free updates from any older version of OS 9 to OS 9.2.2. However, you must install all prerequisite software before installing the next update. To update Mac OS 9.0 to Mac OS 9.2.2, install updates in this order:

1. Mac OS 9.1 Update
2. Mac OS 9.2.1 Update
3. Mac OS 9.2.2 Update

The downloads are available on the Apple site at:

http://docs.info.apple.com/article.html?artnum=75288

Note: You cannot upgrade any version of System 7 or Mac OS 8 to Mac OS 9 through a free update. Apple sells these updates instead. Details are avalable on the page listed above.