OpenCore Legacy Patcher (OCLP) allows older Intel Macs to run newer versions of macOS beyond Apple's official support cutoff. The author walks through installing macOS Sequoia on a 2015 iMac, covering how OCLP works (model-specific OpenCore EFI configs, post-install root patches), practical tips like using wired USB peripherals during setup, and several post-install gotchas: VMware Fusion 26 failing, home directory issues on HFS+ volumes requiring a migration to APFS/SSD, and the critical warning not to upgrade to macOS Tahoe since OCLP doesn't support it yet and USB stops working. Linux was tested as an alternative but failed due to poor Thunderbolt display support. The result is a faster, well-functioning Sequoia install on decade-old hardware.
