Open your app ( Applications > Utilities > Terminal ) and execute the following commands line by line.
The download finished in seconds—impossible for an 8GB file. Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
: hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J Open your app ( Applications > Utilities >
Select Workstation 15.x or 16.x compatibility modes. limited network exposure).
No. Apple stopped supporting Catalina in July 2022. You should not use it as a daily driver on internet‑connected machines unless you take extra precautions (firewall, limited network exposure).