: Addressed graphics corruption issues specifically affecting certain apps on iMac Pro. Compatibility Requirements
: If you already have macOS 10.13.3 installed, you can download the standalone 10.13.4 Update (2.38 GB) directly from Apple Support . macOS High Sierra 10.13.4 Free Download
: If your Mac is incompatible with newer macOS versions, you can find various legacy installers on the How to download and install macOS page. Release Features & Fixes macOS High Sierra 10.13.4 Free Download