Downloaded books will not open in my ereader since I started using 4.0?

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Downloaded books will not open in my ereader since I started using 4.0. The book will not open even though the title is shown. Help?

[Guest]

Hi ,

By EReader ,are you referring to Adobe Digital Editions?If it is something else,please specify.

Regards

Sukrit Dhingra

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MY KOBO GLOW EREADER

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My kobo e reader will not open books transfer ADE since I updated ADE. Any suggestions