Upgrade from OS X Yosemite 10.10.5 to Sierra
How do I manually upgrade from OS X Yosemite 10.10.5 to Sierra 10.11 or higher
MacBook Pro 15", OS X 10.10
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Depending on your Mac and its year will determine what Mac OS you can upgrade to.
macOS Sierra is 10.12, El Capitan is 10.11.
Check your compatibility in Section 1 of all these links
then choose which macOS to upgrade to.
How to upgrade to OS X El Capitan – Apple Support
How to upgrade to macOS Sierra - Apple Support
If your Mac can. upgrade to Sierra it can upgrade to macOS High Sierra,
How to upgrade to macOS High Sierra - Apple Support
How to upgrade to macOS Mojave - Apple Support
Make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
macOS Catalina 10.15 was released recently, the latest version of macOS.
If you are considering upgrading to Catalina be warned that it does not support 32bit apps.
Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,
some updates may be free, some may be paid. Use this app to discover which apps you have
are 32bit, https://www.stclairsoft.com/Go64/. Once the list has been created you can then
contact the developers of the apps to see if they provide 64bit updates.
