Final Cut Pro 10.4.5 was a minor maintenance release focusing on performance and stability
Let’s be honest: Search terms like “MACDMG Top” are hallmarks of cracked software distribution. Because Apple moved to a mandatory App Store model (and later a subscription-like model for Pro Apps bundle updates), many hobbyists stick with the last version that had a widely available, stable crack—which is 10.4.5.
Your query mentions "macdmg," which is often associated with third-party sites offering "cracked" or free versions of paid software.
One reason "final cut pro x 1045 macdmg top" remains a popular search is that version 10.4.5 does not require the latest Apple Silicon (M1/M2/M3) chips. It runs perfectly on older Intel-based Macs.