I've decided to upgrade my MacBook Air 2017 (2.2 GHz Intel core i7), so I clicked on the icon already on my Mac - "Install macOS High Siera" and a message pops up "This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS.
So then I try another icon "Install macOS Mojave" and the same message pops up "This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS.
I go to the App store and cannot find either of these 2 OS, also I click on Updates and got a reply of "No updates available".
1) Can I upgrade from Sierra 10.12.6 to Catalina?
2) Should I upgrade to Catalina?
3) Will Catalina work with the others apps/software that I have like various Adobe CS6 products and MS Office 2016 (currently having update problems maybe due to Sierra)?
4) Can I delete the install files (High Sierra & Mojave) on my Mac?
Thanks
So then I try another icon "Install macOS Mojave" and the same message pops up "This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS.
I go to the App store and cannot find either of these 2 OS, also I click on Updates and got a reply of "No updates available".
1) Can I upgrade from Sierra 10.12.6 to Catalina?
2) Should I upgrade to Catalina?
3) Will Catalina work with the others apps/software that I have like various Adobe CS6 products and MS Office 2016 (currently having update problems maybe due to Sierra)?
4) Can I delete the install files (High Sierra & Mojave) on my Mac?
Thanks