Quote:
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but when I type this into Sigil it doesn't render (it comes up with an error message).
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—and that error message would be ... ?
The "html code" you're referring to are called "entities." Yours are specifically called numeric entities. You certainly shouldn't get an error message if you enter them properly in Sigil's Code View. I don't even get an error message when I enter them in Book View, so I'm not sure what you're doing wrong there.
Also, you don't have to to use entities at all if you don't want to. You can use Insert->Special Character to put the actual typographic curly-quote characters into your work. You can copy them from your PC's Character Map program (Windows and Linux), or you could learn the Alt-codes to type them directly.
You could also try the
PunctuationSmarten Sigil plugin to try to convert them automatically if you have python installed (though no automatic "Click the Go Button and wait" algorithm is going to be entirely fool-proof depending on the level of source complexity involved).