I switched to Mihoyo's new launcher for Honkai Star Rail and for some reason its size is a bit oddly small for my resolution (4k, display size 150%). Then today I saw the Pre-install button was actually blocked by the rotating news and events section.
Then I found this solution from a Reddit thread (of a too large Genshin Impact launcher, of all things) and it solved my issue of not being able to interact with the Pre-install button.
●If you right-click the launcher while totally closed and go to properties, then go to compatibility and then press on "change high dpi settings" it'll open another window and in here on the bottom option check "override high dpi scaling behavior" and select on "scaling performed by:" system(enhanced).
LINK: https://www.reddit.com/r/Genshin_Impact/comments/j08p55/comment/g6p2zb5/
However, it somehow affects the actual Honkai Star Rail game's resolution so remember to switch it back.
PS. This post serves as a reminder to myself for when there's another update in the future.