@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
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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)!