I've just got Altium Designer, and while I was searching for some components I discovered that I only have two libraries:
Is there any way I can add the default libraries to Altium?
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MiscellaneousDevices.IntLib and MiscellaneousConnectors.IntLib are the default libraries for Altium. Other libraries you would either need to download independently or, better yet, create your own. I always create my own libraries, you can find my tutorial here: https://www.youtube.com/watch?v=-kyY25CGJtM
Alternatively you can download non-default libraries from Altium's website:
and install them yourself. Keep in mind that the above link may include out-of-date components, so use them at your own risk. I don't imagine they would change much though, so you're probably fine.