I need to update my MacBook Pro (15-inch, Late 2008):
from OS X 10.11.6 (El Capitan) to OS X 10.12 (Sierra) due to an incompatibility with Traktor:
How should I proceed?
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Here is how I would upgrade a mac from 10.11 to 10.12.
Open the App Store app from this guide and install the upgraded OS.
As pointed out, if your machine doesn’t meet the requirements, you would need to find virtualization software that runs on your hardware and run the newer OS or use your backup to load your data and programs on newer hardware.