This will fail and your Mac will shut downdont worry; this is expected behavior.However, if your Mac is several years old, theres a good chance that the current version of macOS wont run on your Mac; Apple drops support for Mac models that it declares to be vintage or obsolete.
What if I told you there are ways to keep your old Mac running a safe version of macOS for longer There are two options. At the time of writing, the current version of macOS is Catalina (10.15.x), and the two previous versions are Mojave (10.14.6) and macOS High Sierra (10.13.6). Keep in mind that even though these two older macOS versions still receive security updates, not all known vulnerabilities are addressed. Top Rated Internet Security Software 2017 Drivers From PreviousIt uses a similar methodology to so-called hackintosh computers, where additional Apple drivers from previous versions of the operating system are included to make the current version of macOS work with a wider range of hardware. From there, click on System Report or System Information (note that the wording may vary depending on the OS you have installed). In the hardware overview window that pops up, a Model Identifier will be listed; make sure you write it down or remember what this is. This system is several years older than the minimum Apple says is supported. According to the System Report, my MacBook Pro is a MacBookPro5,2. I have installed this patch on even older systems such as the Late 2008 Aluminum Unibody MacBook, and it ran Mojave very well. Of course it is recommended you upgrade your Mac to the maximum amount of RAM and replace your hard drive with a solid state drive (SSD). This will make your machine run a lot smoother regardless of which OS you decide to install. And now for the step-by-step guide on installing macOS 10.15 Catalina on your unsupported Mac. Note that the screenshots below actually show Mojave Patcher (from an upgrade to macOS Mojave, last year), but the process remains essentially the same. Top Rated Internet Security Software 2017 Download The LatestThis will download the latest copy of the installer directly from Apples server. Make sure you set your destination volume to the flash drive after selecting Yes. Once the patcher tells you it has completed the process, you can quit the patcher. Give it several seconds, and then you should be looking at a grey screen with a selection of boot volumes. Select the flash drive that has the patched macOS installer on it and press your return (or enter) key. The Mac will now start booting up from the flash drive, and depending on the age and speed of your Mac and your USB drive, this may take a few minutes. From this window, select Disk Utility and reformat your internal drivenote that this will erase all your files, so you need to make sure youve properly backed up all your important documents before proceeding beyond this point. Make sure the format is set to Mac OS Extended (Journaled) and the partition scheme is set to APFS. Then click Continue and let the installer run as you normally would.
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