How can I upgrade my Mac OS 9.0.4 to Mac OS 9.1?

I recently needed to run an old program on my G4 tower which is running 10.4.11. But whenever I try to run it, the computer (which I call Titania -- from Midsummer Night's Dream) tells me that I need 9.1. I thought I had upgraded to 9.1 before I started on the OS X series, but maybe I didn't. Is it an upgrade from 9.0.4? Do I need to buy it or can I just do a software update?
And if I just do a software update, can someone please tell me how to do that. I haven't used OS 9 in a while and I've slept since then, so there's no way I remember. Can someone tell me the first step. And maybe even the second one.
Also, I've had nothing but trouble since I updated poor old Titania to 10.4.11. She's been a little cranky ever since. Is there any way to downgrade in OS X? If so, does anyone know how to do that?
Thanks in advance for any help on this.
Sincerely,
Titania's Mom

From what I have heard downgrading from 10.4 to 10.3 won't make much of a difference in terms of demands on the computer and you will lose compatibility with many programs. Downgrading even further will really get you into the realm of having problems with newer software, and going below 10.2 isn't advisable even if it may be what was originally supplied with the computer.
We don't know much about your computer. Getting a RAM boost is a relatively inexpensive shot in the arm for some computers.
Have you been performing regular maintenance on your computer? Here's a list of bedtime reading:
Mac Tune-up: 34 Software Speedups
[http://www.macworld.com/article/49489/2006/02/softwarespeed.html]
52 Ways to Speed Up OS X
[http://www.imafish.co.uk/articles/post/articles/130/52-ways-to-speed-up-os-x>
Tuning Mac OS X Performance
[http://www.thexlab.com/faqs/performance.html]
11 Ways to Optimize Your Mac's Performance
[http://lowendmac.com/eubanks/07/0312.html]
The Top 7 Free Utilities To Maintain A Mac.
[http://mac360.com/index.php/mac360/comments/thetop_7_free_utilities_to_maintain_amac>
Mac OS X: System maintenance
[http://discussions.apple.com/thread.jspa?messageID=607640]
Macintosh OS X Routine Maintenance
[http://www.macattorney.com/ts.html#Anchor-31774]
Finally, how much space do you have left on your hard drive? OSX needs for you to leave at least 15% free at all times, the more the better. If you start crowding it it will get cranky and too much it will throw a tantrum (crash your computer).

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