My Google Chrome is not automatically updating the Waves Lite App extension to 0.4.6.3, and I can't find a way to manually do so. Is it ok if I remove the extension and reinstall it? What do I need to recover my wallet then?
The standalone app will update - just give it some time.
If you installed by downloading and unzipping the html, you'll need to do the same with the most recent version. Once installed, all your data should be there so you can login easily without importing your SEED or anything like that. I'd suggest using a fresh directory though and not deleting anything until you're satisfied everything is working ok.