Sorry but forget this addon. It's too outdated and broken to be revived.
I had a look at the code and it will use old API functions which query the server too often (RequestGuildHistoryCategoryNewest) instead of LibHistoire, as well as many global leaking variabes, guild names instead of unique guildIds and so on.
I'm sorry to say but this is nothing one would like or try to revive (at least not me
, and I really had a depp look and tried it).
I'd search for other addons or ask in the official eso forums, or use an addon that is build on LibHistoire (cached guild events, including bank afaik) data. Not sure if there exists any that tarcks banks already, I have not found any.
But perhaps someone more involved into guild management knows a replacement.