Whoa, hold on there friend(s). You have obviously mistaken me for someone who knows what he's doing.
For one thing, (we're talking about manually unzipping 1.7.0 right to the card here) my SD card has two partitions and I don't know which to choose. I suppose I could unzip to both, but that grates on my sense of cleanliness. OK, at a guess I downloaded the 1.7.0 zipfile and unpacked it to the smaller FAT16 boot partition. Makes sense. Incipient problem 1: the FAT16 partition is circa 16MB in size. CHDK 1.7.0 takes up around 15.1MB, so we're getting close there. Anyway, having copied 1.7.0 to the small partition I threw the WP switch and put the SD card in my camera and started it up. Saw the CHDK splash screen. Hit <ALT> and saw the CHDK menu, but in the upper left of the screen was the message "ERROR: MISSING MODULE". I'd tell you which modules were missing, but CHDK didn't tell me. The message was persistent and apparently blinking, as if CHDK were constantly looking for something (and constantly failing). Incipient problem 2: before taking a shot the Canon complained it was out of space. Currently, no images exist on either partition.
At this point I should mention there are actually two SD cards involved. First is my trusty, tried and true pure Canon 32GB SD card that I've been using for over 10 years, and have filled only 8GB so there's plenty of space available. (But no RAW images, either...) That card I consider "golden" and will not try to do anything to it. Second is a card I recently purchased specifically for CHDK use. It's got 256GB so plenty of room for RAW images and, should it ever be possible, RAW video.
I figure the "missing module" problem will eventually be fixed, but running out of space is a different issue.
On a lark, I put my "golden" 32GB SD card into my PC and found ... just one FAT32 partition for the whole card. So despite its age my SX210-IS is capable of booting (and running) from a single FAT32 partition. Incipient problem 3: isn't this 2010 release contrary to the Wiki?
Now I'm confused and at a total loss. Does STICK know how to create, or rather use, a single mongo FAT32 partition? For my (100c) camera? Is that a matter of configuration (how to fix?) or is STICK determined to use dual partitions here?
Thanks so far to both responders. You have helped me tremendously; sadly the problems keep coming. But I take it as a sign of progress, however cloudy the air.