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It looks like according to the site, you just need to download the file, rename it to the proper name, and stick it in /lib/firmware/
Since your exact card isn't listed in their examples, you may need to play around with the names to find the right one. It looks like one of the following should work.
isl3886usb
isl3887usb
You may be able to find more info specific to Slax through the almighty Google.
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