Nevermind, I got it to work myself thru a little bit of hacking. Apparently, Slider Revolution now exports .zip files with a slider_export.txt file inside.
So what I did was just export a dummy zip file, extracted the txt file within, copy and pasted the contents of the revolution-slider-import-data.txt file bundled with Extinct into the dummy txt file, replacing the original content, and then re-zipped the text file back into the dummy zip file and imported it back in.
It seems to have worked, so maybe something to keep in mind for future versions of the theme.
Thanks.
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chom chom