If someone needs a working USB installer for Mavericks as of today do this:
* Download a copy of
this ISO file.
* Download
Balena Etcher.
* Burn the ISO image to an 8GB USB with
Balena Etcher
.
* Boot the USB by holding
OPTION
key at boot and select the installer in a
Mavericks
supported machine.
* Open terminal and issue this command:
* Exit the terminal and proceed with the installation.
The same USB can be used for creating a virtual machine in Parallels as long as you change the date from terminal as described above. For some reason the original ISO file attached as a boot image to Parallels is not recognized and it boots to a forbidden sign screen.