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Installing CS6 on a modern Mac is often impossible due to significant hardware and software changes made by Apple. Creative Suite 6 system requirements - Adobe Help Center
Which of those would you like?
If you're looking for a free or more affordable alternative, consider exploring options like:
Conclusion
Adobe Photography Plan: If you must use Photoshop, the Photography Plan (which includes Lightroom) is significantly cheaper than the full Creative Cloud suite.
What is Adobe Photoshop CS6 Extended?
How to Download Adobe Photoshop CS6 Extended for Mac Torrent