Cannot Detect/Upgrade MacOS Catalina from Mojave
My MBP 2017 four ports with touch bar, cannot detect any software update. I've been performing many steps:
- Through 'System Preference/Software Upgrade'; but then it's always mentioned "Your Mac is up to date - macOS Mojave 10.14.6" (last checked 2 December 2019).
- Through App Store; when trying to download by clicking "Get", it is failed and the message is "The requested version of macOS is not available".
- Through downloading the disk image from https://support.apple.com/kb/DL2022?locale=en_US. But when try to install, again, it's failed, and the message is "This update requires macOS version 10.15".
Anyone know how to solve the problem?
MacBook Pro 13", macOS 10.14