Yes, you have to update to Mavericks. It's worth it only because of the compressed memory.
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So, a few updates:
I reinstalled iWork from the DVD, but I couldn't register it. That's because Apple has exterminated (Dalek pun intended) the registration page from existence. Also, I had to update to iWork 9.3, or else I couldn't even open the apps.
Then, I went to the App Store. Nothing. So, I logged off the App Store. Do this, guys. Seriously.
After all this, and if your OS X is in another language than English, go to System Preferences, click on the UN flag, and drag English to the top of the preferred languages.
Of course, now you have to restart. Even if you didn't had to change the language.
Now, after all of this, open the App Store. With a little bit of luck (at least I felt I was lucky), you might be able to see all of the updates available. And that includes iMovie and iPhoto. GarageBand is not included because it's already a free update (or new app).
The App Store will try to install, reinstall and deny the updates. That happened to me. But they will show up in the updates section. And the App Store will keep asking you for your ID credentials. Suggestion: Try to update a single app at a time.
OK, so I got the updates. Nevertheless, I'm classifying this as a fail by Apple.
- First, because this should have been done years ago, back when the Mac App Store opened. The software was properly registered with Apple when I installed it. They have it on the record. And now, with all of this mess, the whole thing got complicated.
Secondly, Apple should have made it clear, from the start, to both customers and AppleCare employees, that we (the DVD-buyers) had the right to an update.
Third: English, Apple? Really? English? Are all other languages inferior? Really?