Atmosphere and Fusee Not Working? Don’t Panic, Let’s Fix It!

) have strict security that prevents unknown programs from writing files unless explicitly authorized. Common Fixes

: If running it from a USB drive or a download folder doesn't work, move the executable directly into the AutoCAD installation folder (e.g., C:\Program Files\Autodesk\AutoCAD 2013 ) and run it from there. Disable Security Software : Temporarily disabling Windows Defender

AutoCAD needs to write to its "Working Support Search Path." Type OPTIONS in the AutoCAD command line. Go to the tab.

The following steps should be taken to resolve the issue, ordered from simplest to most advanced.