Installation of 10.5.8 was a disaster
When I called Apple support I was told this was the 1st time they heard of such a problem and that I had to go to my Time Machine and Restore. Also that Apple was not responsible for Data Restoration, period.
The support person suggested that I buy Data Restore II and try to get my data back that way. When I continued to protest, he e-mailed me a program to get a dump and ask that I e-mail that back to him, which I did. He then told me it would take 2 days to get word back to me.
After 2 days, he called me and had me enter some code in Terminal which did not solve the problem, and he told me to go to Time Machine and restore.
When I tried that it did not work and I called again. This time the support person told me that what I described could not have happened, and hung up on me.
The next support person told me I needed the original OSX installation disk which I did not have with me, she then told me to use another program which also did not work.
The next support person told me to download Combo 10.5.8 which I did and which I installed successfully. Then by Friday, I figured out how to get most of my Time Machine data back into my hard drive, none of it was obvious, most of the data location I found by Googling, and following the suggested tracks.
Currently I am back in business with some problems. But overall, I would describe the experience as a disaster.
MacBook Pro, Mac OS X (10.5.8)