Standalone Dell computer will read eBooks using Adobe Digital.
Take Kobo out of the mix, as it has its own reader software which can also be read on a computer..
Adobe Digital Editions is an e-book reader software program from Adobe Systems, built initially using Adobe Flash. It is used for acquiring, managing, and reading e-books, digital newspapers, and other digital publications. The software supports EPUB and PDF.
Wikipedia
Purchase and read your favourite eBooks with the free Kobo ...
https://www.kobo.com > desktop
The Kobo Desktop App includes features designed to help you read the way you want. Choose from multiple font styles and sizes, and select your preferred ...
Don't try and mix two devices and three lots of software.
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