After updating iTunes to 12.8.0.150, my iPhones (6 & SE) with iOS 12 beta are not available in iTunes.
When I connect them I get a message:
"A software update is required to connect to iPhoneX,Y.
Would you like to download and install this update now?".
When I press "Install" button after a window saying "Downloading"and another one after a while which displays "Installing"I get error:
"Installation failed. Can't install the software because it is not currently available".
Before updating to 12.8.0.150 no device had a problem to connect to my iMac. I also tried uninstalling my Internet security software but with no change in connections of iPhones.
My OS is macOS High Sierra 10.13.6 and the iMac is mid-2011 21.5". My older device (iPhone 5 with iOS 10.3.3) and my iPad Air 2 with iOS 11.4 are available in iTunes.
