Using v3 viewer with v4 installed
I am having a couple of issues with the version 4 viewer (see my previous 2 posts) that I need to use the version 3 viewer on Windows 10. I have installed the portable version. Is there a way I can have the portable version launch automatically from my version 4 Calibre library? Feel free to point me to an old thread. I tried searching and I can see people doing it, but I can't find the directions.
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