The Upgrade Installation
If Mac OS X version 10.0-point-anything (or 10.1-point-anything) is on your hard drive, the Mac OS X 10.2 installer can neatly nip and tuck its software code, turning it into version 10.2. Everything remains just as you had it: your accounts, folders, files, email, network settings, everything-else settings, and so on.
When you’re ready to perform the upgrade installation, follow the preceding steps 1-4. On the Select a Destination Disk screen, however, click Options.
Now you’re offered four variations of the basic installation. The one you want is Upgrade Mac OS X. Click it and then click OK. Proceed with the previous step 5.
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