same happens when i search for "butter bot" or "butterbot" at the google chrome webstore.
did you remove the bot from there? if so, what's your recommended way of upgrading atm?
best, grinny
now i got a promt within the bot's overlay menu that asked me to download the new version via chrome webstore. worked fine! i had to manually transfer all settings to the new bot, but as pablo already mentioned, this has to be done only once.