There is still value for 9.2.1 if you are not using it under classic.
Reference: http://en.wikipedia.org/wiki/Mac_OS_9
Version: 9.2
Improvements: Improved speed and Classic Environment support.
Version: 9.2.1
Improvements: Minor bug fixes.
Now, I cannot see an upgrade to 9.2.2 being of any value, as below:
Improvements: Bug fixes relating to Classic Environment.
Lastly, OS9Forever Does have a guide for it available (http://web.archive.org/web/20120204045014/http://www.os9forever.com/os9helper.html)
As for the solution, have you attempted to find another source for the 9.2.1 SMI? I believe there are still a few options around, so I would do some searching to find an alternative, such as an abandoned University web page.
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Sidenote
Now, there is someone out there slowing working on a Mac OS 9.2.3 with the goal of adding functionality and bug fixing (http://www.os923.com/). If you plan to test one of the Developer versions out, then you will need to update to 9.2.2 first.
Reference: http://en.wikipedia.org/wiki/Mac_OS_9
Version: 9.2
Improvements: Improved speed and Classic Environment support.
Version: 9.2.1
Improvements: Minor bug fixes.
Now, I cannot see an upgrade to 9.2.2 being of any value, as below:
Improvements: Bug fixes relating to Classic Environment.
Lastly, OS9Forever Does have a guide for it available (http://web.archive.org/web/20120204045014/http://www.os9forever.com/os9helper.html)
As for the solution, have you attempted to find another source for the 9.2.1 SMI? I believe there are still a few options around, so I would do some searching to find an alternative, such as an abandoned University web page.
---
Sidenote
Now, there is someone out there slowing working on a Mac OS 9.2.3 with the goal of adding functionality and bug fixing (http://www.os923.com/). If you plan to test one of the Developer versions out, then you will need to update to 9.2.2 first.