S100 GPS functionality is built into the Canon firmware. You don't need anything in CHDK enabled to use that.
In shooting mode, you just need to go to the Tools tab (the one with the hammer & wrench), scroll down to GPS Settings, select that and turn the GPS menu item to "On". Be aware that the GPS capability of the S100 is not great - it can take many minutes after the camera starts for it to get a satellite lock.
CHDK adds more advanced GPS functionality. Unfortunately, I have not yet updated the CHDK User Manual to explain all that - I'm waiting for the release of 1.4.0 as it has new & improved GPS functionality. In the meantime, for CHDK 1.3.0 there is a google translation of a German CHDK GPS user guide here :
https://chdkde.box.com/s/ftdby4qlyuvsd7o2kl2sWhat link are you using that takes you to a "Cloud Purchase" site? If it's the ones I posted for you earlier today (
link ) then your browser is being hijacked. Those links work fine for me.
