I’ve used the Flip PDF to convert several flash books and they all worked well, but now I need to make a flash slide book, which is slide but not flip. The software seems converts flip book only, or can I make a slide book with it?

Yes, you have only to make a little customize.
Find the “single page” option and switch the under “enable single page” to “enable”. And then switch the “show default” to “true”. Now your flash will be converted as a slide book.

You can switch the page turning effect between sliding and flipping with this button:

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