I want to use iBooks to read the pdf I have synchronized on my old Iphone 4 (iOS7). I can't install it from the appstore on my phone because the latest version of iBooks require iOS 10.
It says "This app needs iOS 10.0 or later"
But according to this link, I can install it through iTunes and then synch it with my phone to get an older version.
Except for the fact that in iTunes (latest version) on my 2 computers (Win10) I can't click on the "get it" button, it is grayed out like shown on the capture :
But I can download any other app without any problem.
So how can I get iBooks on an Iphone 4 OR any free app wich allow me to read pdf (not from links or mail, but the one I've synch with my phone) ?
Best Answer
As the above comment states, you do not need iOS 10 to download iBooks. However, given the info in your screenshot, it is possible that iBooks is not available in your country.
EDIT: iOS 10 is not out. I have no idea why it would require you have it.
Please review the following article and make sure your device is compatible.
https://support.apple.com/en-us/HT201478
SEE ADDITIONAL EDIT BELOW
I just looked at the App Store, and it DOES appear you need iOS 10!
https://itunes.apple.com/us/app/ibooks/id364709193?mt=8