To understand 10.5.4, it’s helpful to look at what it builds upon from the milestone 10.5 release:
: Enhanced stability when playing high-efficiency formats like H.264 or HEVC media. Major Features from the 10.5 Series Final-Cut-Pro-10.5.4-MAS.dmg
: Improves the smoothness and reliability when playing back H.264 or HEVC media files. To understand 10
: You will usually see the Final Cut Pro icon and an arrow pointing to an "Applications" folder alias. Drag the icon into the folder. To understand 10.5.4