Running FCP7 on modern Macs requires specific workarounds, as it is a 32-bit application:
For a smooth installation, use a vintage Mac (such as a 2010–2012 Mac Pro or iMac) running or OS X 10.11 El Capitan . How to Run FCP 7 via Retroactive
OS X 10.11 (El Capitan) – The final version where installation is relatively straightforward.
A: No. FCP 7 is a 32-bit application and will not run on any version of macOS after 10.14 (Mojave), which require 64-bit architecture. For modern macOS versions, you'll need a workaround or an alternative.
Editors who spent a decade mastering FCP 7 keyboard shortcuts can sometimes achieve faster rough cuts in the legacy environment. The Reality of Final Cut Pro 7 DMG Links
A highly powerful, industry-standard editor and color-grading suite that offers a comprehensive free version.