The download typically requires a compatible Mac; if yours isn't, the "Get" button may be greyed out .
or through the App Store, you may need to convert the installer into an ISO format if you intend to use it for virtual machines or non-Mac hardware. Direct Download Links & Methods Official App Store (Recommended) : You can download the full installer directly from the Apple App Store Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
# Create DMG for ISO hdiutil create -o /tmp/Catalina -size 8500m -layout SPUD -fs HFS+J hdiutil attach /tmp/Catalina.dmg -noverify -nobrowse -mountpoint /Volumes/install_build sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --nointeraction hdiutil detach /Volumes/Install\ macOS\ Catalina hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso The download typically requires a compatible Mac; if
Once you have the official .app installer, convert it to a bootable ISO yourself: if yours isn't
: hdiutil create -o /tmp/Catalina.cdr -size 8500m -layout SPUD -fs HFS+J