[KevinH]

No big changes in reading in from the opf ... but Sigil depends on knowing the opf version and the error does refer to the package tag being not-parseable. One quick thing that would help is to open it in Calibre and screenshot the opf in the Calibre Editor and post those screenshots here so that we can work on getting this fixed in time for the next release. Or even more simply, copy the bad epub and unzip that copy and manually extract the opf and post it here. That would probably be best.