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"Opera 11.52 won't install..."
I like Opera as a browser, but...
11.52 will not install and run on my Powerbook (power PC) running OSX 10.5.8. I had to restore version 10.63 in order to get it to run.
I won't attempt to download it again until I can be assured that it will install and run on Power PC with OSX 10.5.8. Otherwise it's a big waste of time. I'm sure it's fine on an Intel Mac.