Quote:
Originally Posted by stumped
( because I could not perform some sigil edit in an epub 3 source, I tried the above & it worked 1st time. I was able to edit the output file which sigil reported as being epub 2 }
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I'm assuming the Sigil edit you could't make was changing the OPF's package version attribute from 3.0 to 2.0? Because that's frankly the only portion of the source Sigil won't allow you to edit manually (in any kind of epub).
If you're happy with the outcome, that's all that matters. Just know that a full calibre epub to epub conversion to go from 3 to 2 is a pretty drastic solution (from a volume-of-code altered standpoint). Especially if the ultimate goal is to get the epub into Sigil for editing. Most commercial epub3s can be manually converted fairly simply with Turtle91's above described procedure. With something like 7Zip, you can even edit the OPF within the epub archive and skip all the renaming unzipping/rezipping.
I'll see if I can't resurrect my input plugin that fixed opfs that incorrectly had 1.0 package versions and adapt it to change the 3.0 to 2.0. It won't automatically convert an epub3 to epub2 entirely, but it should get one into Sigil in an editable state where the rest can be done manually.