Pre-install Resource Package Size for Ver. 2.5

Download size: ~3.04 GB (english-voice only installed, depends on your currently installed voice-over)

Total size after download: ~18.8 GB (in 2.4)

Will apply after complete install the live 2.5 application: ~17 GB (+5.93 GB if fully installed voice-over language).

But last on the list. The size of the game will be reduced a bit by removing some of the previous events in the past since initial release. To be expected after complete update will change. So beware of that.

Here is the notice: https://www.hoyolab.com/article/3355051/