Use APKPure App
Get BlitzModder old version APK for Android
Mod Manager for World of Tanks Blitz.
BlitzModder makes it much easier to install mods in Blitz.
This app includes not only Gfx mods such as reticle or tank skin, but also Sfx mods such as gun sounds or voice.
Also, I have contacted all the mod creators and got the permission to add them to BlitzModder.
If you want to know how to use, please refer to its website.
[Notice!!]
BlitzModder may not work on Android OS 4.3 or below. I am researching the cause of the problem (but it is difficult because I don't have a device under 4.3).