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If you copy and rename your epub to end with .zip, unzip your epub and add the xml header declaration to your opf file, and rezip it, and rename it to .epub, you should load into Sigil just fine with nothing changing your package version any longer.
Either that or use DiapDealers new import plugin to load your epub. Once saved, you should not need to worry about using the plugi for that epub in the future as Sigil itlsef adds the required xml declaration heading.
Please let us know if that doesn't do the trick. The real fix will appear in the next release.
KevinH
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