There is a Chinese character that is written wrongly: 有一个字写错了

[septsea]

On page 23, 就 in 通常我个人会比较建议在跨版本升级前卸载就版本 is wrong; 旧 is supposed to be used.

在页 23, 通常我个人会比较建议在跨版本升级前卸载就版本 的 就 错了; 应当用 旧.