Can't update OS in my MacBook

We can provide more specific advice if we know more about your computer model, age, and specifications. To get more information about your computer, go to the Apple in the upper left corner of any window, then "About This Mac", then "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present). You can also use this information and the links below to yourself determine what is possible with your computer.

Click on this link to read how to get other versions of macOS - https://support.apple.com/HT211683

- This article also has links to system requirements for each OS version which you should check against your exact computer model. Also make sure you have more RAM than what is noted as "minimum" for any particular system or your computer may run slowly.

- You may find you need to use Safari to get any links using the Mac App Store application to open a functioning page.

Back up your data in case something goes wrong --> Back up your Mac with Time Machine - https://support.apple.com/HT201250 or use a cloning tool.

Check if your old apps will still work with with the OS you want to install - https://roaringapps.com/apps This is particularly critical if you are upgrading to Catalina or newer.

What model/year computer? Upgrading from what OS version to what OS version? What happens when you try?

Where exactly are you having problems? Our solution depends upon getting information from you.