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Should I update from Sierra?
The short answer is that if your Mac was released within the last five years, you should consider making the leap to High Sierra, though your mileage may vary in terms of performance. OS upgrades, which generally include more features than the previous version, are often more taxing on older, underpowered machines.
What is the next upgrade from Sierra?
Apple has announced the launch of its new operating system, macOS 10.15 Catalina on October 7, 2019. In keeping with Apple’s release cycle, macOS 10.12 Sierra will no longer be receiving security updates. Sierra was replaced by High Sierra 10.13, Mojave 10.14, and the newest Catalina 10.15.
Will I lose data if I update my OS?
If it a official update, you are not gonna loose any data. If you are updating your device via custom ROMs then most likely you are gonna loose the data. In both cases you can take the back up of your device and later restore it if you loose it. If you meant updating the Android operating system, the answer is NO.
Can you upgrade from 10.12 to 10.13 High Sierra?
10.13 High Sierra is an upgrade and will not show up in your Updates section. Any link you have probably followed will be a link to an update for 10.13 High Sierra can not be applied over 10.12 Sierra, you need to down load the full High Sierra installer.
Is it possible to upgrade from macOS Sierra to Mojave?
Based on the results of menu : About This Mac panel, compare the introduction timeframe in parenthesis (e.g. Late-2013) to the models in How to upgrade to macOS Mojave. The Mac App Store may block your access to High Sierra if your hardware supports the Mojave installation.
How to install macOS High Sierra on a Mac?
The full installer for macOS High Sierra (4.8Gbs) gets downloaded to your Applications folder, so look for Install macOS High Sierra.app, make a copy of it and keep it safe, the one in the Applications folder self deletes when the installation has completed. double-click Install macOS High Sierra.app to start the installation.
Do you need a copy of 10.13.6 installer?
It is handy to have a copy of the installer in case you want to install on another Mac or need it of any problems later on, saves having to download it again, which can be painfully slow. As Eau Rouge mentioned, keep a copy of the Installer of Full 10.13.6.