When I try to install adobe digital editions on ipad2 - it says safari cannot open this file.
This would be correct as Adobe Digital Editions only works on Mac OS or Windows. Please see View e-books | iOS, Android devices - http://helpx.adobe.com/digital-editions/kb/view-e-books-ios-android.html for information on how to view your eBooks on iOS devices.
Moving this discussion to the Adobe Digital Editions forum.
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