The most important of these is to back up your Mac before you start the installation process so that you can recover from any installation issues that may arise. You should also take basic steps to ensure you can recover from any install issues you may come across. Even so, it’s a good idea to review our Rocket Yard guides for a clean install of macOS Catalina as well as an upgrade install of Catalina. Uncheck "Install macOS Updates" & "Install system data files and security updates".Installing a new version of the Mac OS is generally a fairly pain-free process this trend continues with macOS Catalina. ![]() Go to System Preferences > Software Update. Just make sure you don't install macOS Big Sur, and make sure automatic macOS system updates are unchecked to prevent your machine from automatically installing updates and potentially avoiding your machine from being bricked. It also appears that after this update process, it enables permanent updates for macOS for the general public instead of the betas. You may or may not get a message saying that some patches (Night Shift Patch, for example) were overwritten by the update. After your machine reboots, make sure to open Patch Updater and check for any patch updates for the system.It’s a bit slow at first but it will reboot properly. Your machine will reboot normally to the login screen.If you miss it, you’ll need to reboot into the installer USB again to repeat Step 10 and 11. Pay attention to it, because when the patch process is complete, make sure you check the box that says "Force Cache Rebuild", then click Reboot. Make sure that the "Legacy Platform Compatibility Patch" is selected if its not already. Make sure you select your correct Mac model. If you haven't already, plug in your Patcher USB, select it and boot to it. When your machine reboots, hold down the Option key.Before the installation process is complete, you will need your Catalina Patcher USB. Let the update run through the installation process.When the update comes up again, hit "OTA Update Fix" again before you press Install. Open System Preferences > Software Update.When your machine reboots, open the CatalinaOTAswufix app then click "OTA Update Fix".What will happen is, the computer will seem as if its installing it, but it actually reboots your machine instead. ![]() (This also applies for Supplemental Updates.) Click Download and install as if you were doing a normal update. ![]()
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