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somedaygone · 12-14-2019, 12:56 PM

That link helped but I had to dink around a little more. Here's a little more complete steps of what worked for me in Windows 10.

• Download Calibre portable v3.48 (last version of the old reader)
• Go into the main Calibre program (for the current version, not portable).
• Click Preferences > Change calibre behavior
• On the right, uncheck all file extensions that you want to move to the old reader (AZW3, EPUB, HTMLZ, MOBI)
• Select a book with that file type in your library
• On the right pane next to Path, click the Click to open link
• Right click the book with that file type and choose Open with > Choose another app
• Scroll down to the bottom and check the box next to Always use this app and then select Look for another app on this PC
• Navigate to the folder where you've installed Calibre portable 3.48 and select ebook-viewer.exe (for me, it's in \OneDrive\Calibre\Calibre Portable\Calibre\ebook-viewer.exe)
• Close the ebook viewer and go back to the main Calibre window. Try opening the book from there and it should now open in the 3.48 viewer.

12-14-2019, 12:56 PM	#3
somedaygone Junior Member Posts: 6 Karma: 10 Join Date: Dec 2019 Device: Win10	That link helped but I had to dink around a little more. Here's a little more complete steps of what worked for me in Windows 10. • Download Calibre portable v3.48 (last version of the old reader) • Go into the main Calibre program (for the current version, not portable). • Click Preferences > Change calibre behavior • On the right, uncheck all file extensions that you want to move to the old reader (AZW3, EPUB, HTMLZ, MOBI) • Select a book with that file type in your library • On the right pane next to Path, click the Click to open link • Right click the book with that file type and choose Open with > Choose another app • Scroll down to the bottom and check the box next to Always use this app and then select Look for another app on this PC • Navigate to the folder where you've installed Calibre portable 3.48 and select ebook-viewer.exe (for me, it's in \OneDrive\Calibre\Calibre Portable\Calibre\ebook-viewer.exe) • Close the ebook viewer and go back to the main Calibre window. Try opening the book from there and it should now open in the 3.48 viewer.