If you want to install the old version of macOS, you need to obtain it through Apple Developer Center, specific links or third-party sites. The verification methods include checking the signature certificate, comparing hash values and testing startup disk production; the support period of the old system is about 5 years, such as Ventura and Monterey are still supported, but long-term use faces compatibility, security risks and App Store restrictions. During operation, the legality of the download source and the system support status should be confirmed in advance.
Apple's system is updated quickly, and sometimes you may not want to use the latest macOS, such as to be compatible with old software or device drivers. At this time, I want to install an old version of macOS, but the official does not directly provide the "download historical version" entrance, which is a bit of a threshold for operation.
In fact, as long as you understand a few key points, it can still be achieved.
How to find the old version of macOS installation package?
Although Apple does not display the old version of the system on the homepage of the official website, some historical versions can be found in the developer website and some specific links. Common ways are:
- Visit Apple Developer : You need to register a developer account (free) and then search for the corresponding version, such as macOS Ventura 12.x, macOS Monterey, etc.
- Use the correct installer link : Apple will generate an exclusive recovery image (such as
InstallAssistant.pkg) for each system version, which can be downloaded through a specific App Store or technical support page link. - Third-party archive sites : Some technical communities or forums will save the official installation package hash value and download address, but special attention should be paid to security and integrity verification (it is recommended that only download dmg or pkg formats and check SHA256 values).
Note: Not all old versions have always been available, and Apple usually retains download permissions for the previous generation system within one or two years after the new version is released.
How to verify whether the downloaded system is officially authentic?
The downloaded installation package cannot be used directly, especially those obtained from unofficial channels. It is best to do a few checks:
- Check the signature certificate : You can use the terminal command
spctl -a -t install -v [安裝包路徑]to see if it is published by Apple. - Comparison hash value : There are enthusiastic people on the Internet to share the SHA256 or MD5 values of the official installation packages of each version, which can be used for comparison and verification.
- No errors were reported when creating a boot disk using Disk Tool : If the USB installation disk fails to create, it is likely that the file is damaged or the unofficial version is not available.
If you are not sure whether the source is trustworthy, it is not recommended to install it directly on the main system. You can test it in the virtual machine first.
Can old versions of macOS be upgraded and supported?
This depends on the specific version. Apple generally provides security update support for each major version for about 5 years. For example:
- macOS Big Sur has stopped official support and no longer receives security patches.
- macOS Ventura and Monterey are still within support, but will also gradually withdraw in the future.
If you plan to use old systems for a long time, you need to pay attention to:
- Software Compatibility: Mainstream software such as Chrome and Office may stop supporting older systems.
- Security risk: No patch updates are susceptible to new vulnerabilities.
- App Store Download Limits: Some new apps on the shelves may not be installed in the old system.
Therefore, unless there are special needs, it is not recommended to stay on too old versions for a long time.
Basically that's it. The operation process is not complicated, but there are several key points that are easy to ignore, such as the validity period of the download link, the legality verification of the installation package, and the system support cycle. Just confirm in advance and it will be done smoothly.
The above is the detailed content of How to download an old version of macOS?. For more information, please follow other related articles on the PHP Chinese website!
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