For Mac users, version 18.1 was particularly stable, leveraging Apple’s Metal graphics framework for smoother viewport navigation.
Websites offering "free" or "cracked" versions of SketchUp Pro—especially older builds like v18.1—often carry significant risks: sketchup pro 2018 v181 3d designer mac os x free upd
For designers working between Mac and Windows environments, the improved DWG handling made cross-platform collaboration much smoother. Technical Specifications for Mac OS X For Mac users, version 18