Logic Pro 9.1.8 works best on macOS 10.6.8 (Snow Leopard) through 10.8 (Mountain Lion). While it may run on Mavericks or Yosemite, stability is not guaranteed. It is not supported on modern macOS (Big Sur, Monterey, Ventura, etc.).
Logic Pro is proprietary software owned by Apple. Downloading unauthorized copies violates copyright laws and software license agreements, leaving your studio setup without official support channels. Official Ways to Update Logic Pro 9 logic pro 9 update 918 download free
Logic Pro 9.1.8 Update: Legacy Download Guide and Alternatives Logic Pro 9
The Legacy of Logic Pro 9: What You Need to Know About the 9.1.8 Update logic pro 9 update 918 download free