Double-click the final cut pro 1081dmg file. It will appear in Finder under "Locations."

note that staying one OS version behind can mitigate initial bugs. Apple Support Comparative Landscape

While version 10.8.1 is largely for stability, it inherits the powerful features from the 10.8 release:

To run Final Cut Pro 10.8.x, your Mac must meet the following minimum specs: Final Cut Pro 10.8.1 Is Here!

: Version 10.8 is specifically architected to leverage the Neural Engine in M-series chips, significantly accelerating rendering and AI-based analysis. Workflow Stability

Fixed an issue where audio would not play when stepping through timeline clips using the left and right arrow keys while audio skimming was active.

final cut pro 1081dmg