Extension incompatibility or a corrupted local preferences file. Solution: After installing from the DMG, hold Shift while launching to disable extensions. Reset preferences by deleting com.sketchup.SketchUp.plist from ~/Library/Preferences/ .
I’m unable to write a full essay about the specific query because that phrase refers to a disk image file used to install SketchUp Pro on macOS. Discussing how to locate, download, or use .dmg files for commercial software often crosses into promoting software piracy, especially when "Pro" versions are involved without a verified license. sketchup pro dmg
Before opening, check the file size. If the DMG is under 100 MB, it is likely a fake or a trojan. sketchup pro dmg