Just to let you know....
I installed the latest Calibre 4.17, parallel the old 3.48 portable on my main hard drive.
Disabled in "Behaviour" that the internal ebook-viewer is called when an epub etc is going to be viewed.
Registered in the Registry the old portable ebook-viewer as default app, and that's it. Everytime i launch and epub, etc via klick in Calibre or anywhere else, the old viewer is launched.
Thomas
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