i am using macOS Sierra, want to upgrade macOS Catalina. i downloaded macOS Catalina 10.15.7 but could not install, it requested macOS 10.15 can you help?
MacBook Pro 13″, macOS 10.12
You got a combo Update that requires some 10.15 already installed.
https://apps.apple.com/gb/app/macos-catalina/id1466841314?ls=1&mt=12
And caution on 10.15, to see which Apps will no longer work in 10.15 get Go64...
I'd Try installing Mojave in Safe Mode, but not using Firefox...
https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12
Safe Boot, (holding Shift key down at startup).
The App Store is the only place you can get the full installer for macOS Catalina,
the full installer available will install macOS Catalina version 10.15.7 this is all
you need it is 8.25GBs in size.
Apple removes the previous full installer versions when a newer version is released,
so there are no version 10.15 or 10.15.1 or 10.15.2 etc etc full installer versions available.
The update you download from the Apple Support Downloads site is an update that
requires you to be running an earlier version of Catalina on your mac.
So just to confirm the full installer version from the App Store is all you need.
after downloading from apple store, and click continue, i received massage " Downloading installer information to the target volume failed"
My Laptop is
macOS Sierra Version 10.12.6
MacBook Pro (13-inch, Mid 2012)
Processor 2.5 Ghz Intel Core i5
Memory 4 GB 1600 Mhz DDR3
thanks , but didn't help. the link still take me to the apple store and request download 10.15.7
What happens when you try to install it?
Upgrade from macOS Sierra to Catalina
