![]() I wonder if jmtanzillo reply is an official Valve reply because if it's that case in my opinion is unacceptable. Now, you need to use TransMac to create the bootable USB with the extracted BaseSystem.dmg file.I'm facing exactly the same issue than High af. Step 4: Format the USB drive and restore the macOS dmg file to it Drag and drop the BaseSystem.dmg file to your desktop.Click the InstallOS.pkg file > OS X Install ESD from the left sidebar.Tick "Show hidden and system files (use with caution)" and click OK.Choose the InstallOS.pkg file and click Open.Select "All Files (*.*)" in the drop-down menu to reveal the InstallOS.pkg file. ![]() Click File > Open Disk Image, then navigate to your desktop.Inside it, you'll find the InstallOS.pkg file. ![]() In the left sidebar, click InstallOS.dmg, and then the "Install macOS" folder.Browse to the macOS dmg file you downloaded before, select it, and click Open.Go to the File menu and click "Open Disk Image.".Wait for the countdown and click the Run button.Click Yes to allow it to make changes to your device.Right-click on TransMac and select "Run as administrator.".The next step is to clean your USB stick and make sure it has a GPT partition scheme. Step 2: Convert your USB stick to the GPT partition scheme It's a paid tool with 15 days of free trial. TransMac is needed to burn the macOS dmg file to your USB drive to make the bootable installer. ③ Download and install TransMac on Windows. If the link no longer works, try searching for a keyword like "macOS High Sierra dmg" and get it from the available resources. To download OS X 10.9 Mavericks, macOS High Sierra, and later versions on Windows, you can check out this link first. To download macOS 10.12 Sierra, OS X 10.11 El Capitan, OS X 10.10 Yosemite, OS X 10.8 Mountain Lion, and OS X 10.7 Lion on Windows, you can click this Apple's link, and scroll to the "Use a web browser" section, then tap the download symbol. You'll also need to download the dmg file of the macOS you want to use on your Windows PC, for example, the macOS High Sierra dmg file. ![]() ② Download the macOS dmg file on Windows. Its data will be erased when making the bootable installer, so ensure the essential files are all backed up. Prepare a USB drive with at least 16GB of storage space. ① Prepare a USB flash drive or another type of USB storage device. To create a macOS bootable installer on Windows 11/10/8/7, you'll need the following items: Step 1: Preparation before creating a macOS bootable USB on Windows 11/10/8/7 So ensure the bootable installer you want to create is compatible with your Mac model before getting started. In other words, if your Mac came with macOS Catalina, it won't boot from a macOS High Sierra bootable installer. Please note that your Mac can't boot from a macOS version older than the one it shipped with. In this section, we'll give detailed instructions on how to create a macOS bootable USB on Windows. How to create a macOS bootable USB from Windows? FAQs about how to make a macOS bootable USB from Windows
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