Hi RehabMan,
Maybe you could help me with this.
From a ProBook 6560b with Mavericks 10.9.5 (installed with Clover Bootloader or PBI Clover edition, can't remember exactly) how can I update to El Capitan, Sierra or High Sierra?
Went to El Capitan download page
https://support.apple.com/en-us/HT206886
Clicked on "Get OS X El Capitan" text link on the page and it opened App Store. Clicked on "Get" button and "This version of OS X 10.11 cannot be installed on this computer." pops up. I understand as long as your computer is compatible with higher grade OS X it doesn't let you install less than that.
Did the same with Sierra page
https://support.apple.com/en-us/HT208202
It let me download it but after restarting to continue installation nothing happens. I login as usual onto Mavericks
On High Sierra things are different
I download it directly from App Store but the installer file only has 20 MB and it created a separate 5.2 GB folder on my system partition
How can I properly update to any of the mentioned OS X versions? Pardon me macOS for now
Thank you