@all: If it's still showing the default screensavers after an install (and without tweaking the screensavers folder), then you need to pay attention to the update process, because it most likely failed
If it's showing the default screensavers *after* tweaking the screensavers folder, and a full restart, then the files are probably in the wrong format. (Check the screensavers folder, if it's empty/missing some of your stuff: wrong format. If you still see your custom stuff: see my previous paragraph).
On the Waterstones front, no news, since I've been pretty swamped IRL, and I don't have a Waterstones device to check it out myself.
@Pushka: Python is only needed for the cover mode. That said, it should be installable (especially if the screensavers hack itself is installable on your device)!