The original question was not how to get rid of OS-X, but how to install an upgrade to OS 9.1 when he found a new program wouldn't install with his current OS 9.0 installation. Your comment made me think----Does ResEdit still work with OS-X.x.x? I used to use it quite frequently with OS 7.x and 8.x, but not lately and not with OS-X at all. I will let you try it out and give us the answer.