Go to Video and ensure you have at least 128MB of video RAM.Go to CPU & Memory and make sure you have at least 2048MB of RAM.Go to CD/DVD 1 and insert the ElCapitan.dmg file you created.Go to the Hardware tab, then go to USB & Bluetooth, and turn off USB 3.0 support or the installer will kernel panic during boot.Tick “Customise settings before installation” and click continue.When asked what type of OS you’re installing be sure to pick OS X.Install Windows or another OS from a DVD or image file.Open Parallels, and press the + button to create a new VM.
Hdiutil detach /Volumes/OS\ X\ Install\ ESD/Īnd now we need to get it back into that read-only DMG format: hdiutil convert ElCapitan.sparseimage -format UDZO -o ElCapitan.dmgĪnd let’s throw away the read-write version to free up disk space: rm ElCapitan.sparseimage Step 3: Create a virtual machine Now we want to eject both of those: hdiutil detach /Volumes/OS\ X\ Base\ System/ Now we want to copy the files from the Install ESD into the writable image we made: cp /Volumes/OS\ X\ Install\ ESD/BaseSystem.* /Volumes/OS\ X\ Base\ System/ We also want to mount the InstallESD.dmg file from inside the installer we downloaded from the App Store, as it has some files we’ll need to copy over: hdiutil mount /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app/Contents/SharedSupport/InstallESD.dmg Let’s throw away the read-only version now: rm ElCapitan-base.dmgĪnd now we want to mount the disk image so we can add some files into it: hdiutil mount ElCapitan.sparseimage To fix that we need to get a read-write (sparse image format) copy of the image: hdiutil convert ElCapitan-base.dmg -format UDSP -o ElCapitan.sparseimage At the moment, though, that’s missing the copy of OS X that it actually needs to go and install into your VM. Okay, so that’s built us a read-only (DMG format) bootable image for the installer. Now we want to use that iesd tool to build a bootable image from the installer we downloaded from the App Store: iesd -i /Applications/Install\ OS\ X\ 10.11\ Developer\ Beta.app -o ElCapitan-base.dmg -t BaseSystem (Warning: you’ll need at least 15GB of disk space free to deal with this next section safely… more if you don’t clean up the two temporary images we build along the way)įirst up we want to install the iesd Rubygem which provides a nice way to deal with Apple’s InstallESD.dmg files: sudo gem install iesd This section is all command-line stuff, so go fire up Terminal.app. So let’s take a look at those, one by one… Step 1: Download El Capitan from the App StoreĬurrently you need to be a registered developer. Provided you are, you can download the beta from Apple’s website (this redeems a coupon inside the App Store, so you need to be on a Mac to start the download). Essentially there are 4 main things we need to do:
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