hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/Mavericks
: While Apple provides Mavericks 10.9.5 Update (Combo) files, these are updates and require a base version of 10.9 already installed. Unofficial but Reputable Archives
Ultimate Guide to Downloading Mac OS X Mavericks 10.9 ISO and DMG Files mac os x mavericks 10.9 iso and dmg image download
You now have a clean, official, and bootable Mavericks 10.9 ISO for VMware/VirtualBox.
Browse and select your downloaded file, then click OK . hdiutil convert /Volumes/install_app/BaseSystem
OS X Mavericks 10.9 ISO and DMG Image Download: A Complete Guide
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: If you previously "purchased" (downloaded) Mavericks, open the App Store on an older Mac, go to the Purchases tab, and find it there to re-download.
Use the createinstallmedia command in Terminal. For Mavericks, the command might look something like this: