Here is a link to the download folder for version 0.53. https://mega.nz/folder/BOpWkZAC#qr1nDEKoKzGJD7K6AxemQw If you are able to run version 0.53.4 from there, then you could try copying the www folder from the new version into that and seeing if that works. If version 0.53.4 no longer works, I'd have to assume something has changed for the Steam Deck, in which case I don't know what else to try unfortunately.