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What OS? If Linux, they can use my standalone package (details in one of the sticky threads). It's not "portable" but it can be installed alongside the standard installation. It uses a different preferences location.
If Windows or OSX, just back up the preferences folder and install the newer version. You can always roll back to the old one and restore your preferences. But you can't really have isolated installations of two official Sigil versions imultaneously.
You could always see if there's a portable version of Sigil 0.9.x if you're on Windows. We don't support or endorse (or condemn) the portableapps version, but it should be fine for a test drive on Windows alongside the official 0.8.x series.
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