Insert your original DVD or mount the disk image. Install the application. Do not open it yet.
If you a legitimate copy of Logic Pro 9, you can download the 9.1.8 update by logging into Apple’s “Downloads for Apple Software” page (if still available) or contacting Apple Support — though note that Logic Pro 9 is long discontinued and not supported on modern macOS versions. logic pro 9 update 918 download free
If you were running Logic Pro 9.1.7, 9.1.8 was essential. Insert your original DVD or mount the disk image
: Corrects an issue with the ES2 synthesizer that could cause distortion when using sidechain as a modulation source. MIDI & Audio If you a legitimate copy of Logic Pro
The update itself is a free download, but you must already own Logic Pro 9. There is no legal way to download the full Logic Pro 9 software for free today. Apple has discontinued selling Logic Pro 9; the only version currently available for purchase is Logic Pro (formerly Logic Pro X) on the Mac App Store.