How to upgrade MySQL from 8.0 to 8.4?

I'm on Windows. I installed MySQL 8.4, stopped all services and copied the Data folder and my.ini files into the 8.4 folder but now the 8.4 services does not start and does not produce any logs. I can't find an answer that doesn't involved either replacing the data (ie what I did) or replacing the binaries (which is what I did just the other way around). What is the correct way to do this?