6.4.1

更新内容：
优化保存下载文件时的覆盖名字逻辑；
修复遗失的设置。

Changes:
Optimize the filename overwrite logic of saving filename;
Added missing setting.

FILE	MD5	SHA-256
chrome.zip	54501E9AE2FB6DCD8C4B53FCD8BAC36D	42ABDB3B26DCFA5CABF8BBBBCE0FBFA634F5DED28D934B57605A15ACAF73FAC7