Can I install Internet Explorer 11 on my Mac Desktop?

If you're on a PowerPC Mac, no.

If you're on an Intel Mac, not outside of Windows, CrossOver Mac, Wine, or similar software.

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No. It runs on Windows. There is no version of Internet explorer for OS X any more.

The only way to run IE on a Mac is to run Windows in a VM or via Bootcamp or by using something like CrossOver Mac.

All the solutions suggested require an Intel-based Mac. the PowerPC (PPC) iMacs covered in this forum cannot use those solutions.