How to prevent moding game without redownloading

Hi! i currently modding unity mobile game, specially for language localization (chinese game). i already know which files that storing language values but when loading game, the game detects that those file size is not same as original (because i was modding its value) and it redownloading the modded assets, the funny is game is stuck with (currentsize / originalsize) for example (3.81MB/3.61MB downloaded..) download progress. How can i solve this problem? i was trying to find file that stores all data list with size but not found it yet! also is there possibility to edit assets file without file decompressing? (because size matter on this game)