I have had two people report, with previous versions, that the auto-updater appeared to run the installer but then didn't actually install anything. If you can reproduce that, please let me know.
XScreenSaver 5.29 out now. The DMG of this version should work again on MacOS 10.6 and 10.7. I had to downgrade to Xcode 5.0.2 to make that work, because Apple are jerks.
Current Music: The Naked and Famous -- The Sun ♬