Step 3: Open the macOS Big Sur Patcher file. Step 4: Insert USB Drive. Step 5: Install macOS Bir Sur on Unsupported Mac. Install macOS Big Sur on unsupported Mac: Some common errors and their fix. Wi-fi still not working. Big Sur is very slow. How to speed up macOS Big Sur. While you can’t install macOS Catalina officially on your unsupported Mac but thanks to the Catalina Patcher third-party tool. The macOS Catalina Patcher tool will definitely work fine to install macOS on the above unsupported Mac. This problem is occurring for thousands and maybe a million Mac users, so there’s a should be a solution. Install macOS Catalina on Unsupported Mac. Now, follow the steps shown below carefully to load the installer, erase your local disk, and install macOS Catalina from USB drive you created in above step. Step 1: Boot Mac from USB Installer. To do this, insert the installer and hold down the Option key as you restart your Mac.
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