My system doesnt give me an option to update

The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Make sure to use Only Safari to commence the download as Others may not work

Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is no workaround.

Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation

Back up your data, check your applications for compatibility, and depending on which Mac model you have, click on High Sierra, Mojave, Catalina, or Big Sur.

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samanthatyrrell Said:

"My system doesnt give me an option to update: how do I update my system when there is no system update option in my settings? MacOS Sierra"

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To Find the Option:

1. Go to: Apple menu
2. Select: About This Mac
3. Click: Software Update... button
4. Proceed form there as necessary