How can I update to MacOS 10.15?

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.

And use Go64 to check for 32 bit application

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 unless your Mac is a 2010 or 2012 desktop Mac Pro, click on Catalina. If it is, you can't.

(202527)

❗️ – IMPORTANT – Your 32-bit apps won’t work in Catalina or Big Sur.

This includes MS Office, older versions of Photoshop, Adobe Creative Cloud apps and many others.

Use this free utility to check the compatibility of your apps:

St. Claire Software – Go64: https://www.stclairsoft.com/Go64/

fchisari Said:

"How can I update to MacOS 10.15 from MacOS 10.14?"

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What happens when you try? Any messages?