You can find out how to get beta versions of Apple's operating system here.
In the case of mac OS High Sierra, here is a full list of the Macs that will be able to download the Mac OS upgrade.
It's not just Apple developers who get to try out the new software - if you would like to be a public beta tester your can find out more about that scheme here: How to get the latest Mac OS beta.
If you'd like to find out a bit more about mac OS High Sierra before downloading it, read our comparison ofmac OS Sierra vs High Sierra to find out how it compares to the previous version. Following WWDC in June Apple issued a beta of High Sierra - we expect that the same will happen with mac OS 10.14.
Both tests check your Mac for other hardware issues, such as bad RAM.
If it's just an update to the current version of the Mac OS you need to install jump to this section: Install an update to Mac OS If you want to know how to update your apps on your Mac, read this: How to update all your Mac apps.
You can find out more about the system requirements for mac OS here.
Apple says that you need at least 2GB RAM to run Mac OS High Sierra, but this is unlikely to be a problem as all the supported Macs have at least 4GB RAM, and these days most Macs have 8GB as standard, some even have 16GB.
To get mac OS High Sierra on your Mac you need to do the following: Luckily the download happens in the background, so you can continue to work or surf the web.
Once the installer has downloaded you are ready to install the mac OS software on your Mac.
Here's how to install mac OS High Sierra on your Mac: As we said above, we recommend that you don't jump right in and install the new software straight away though.