The last kiwix zim dump of English Wikipedia before the release of ChatGPT is from May 2022. The Internet Archive still preserves the torrent[0]. To host this, or browse it locally you can use `kiwix-serve -p 8888 wikipedia_en_all_maxi_2022-05.zim` from kiwix-tools[1].

[0]: <https://web.archive.org/web/20221007114937/https://download....>

[1]: <https://github.com/kiwix/kiwix-tools>