Installing ACES in Blender is fairly simple. You just have to open the installation folder of Blender on your computer, which you can usually find under Program Files > Blender Foundation > Blender x.xx. In this Folder should be one folder which has the same name as the version of Blender you are using, like 2.93 for example. In this folder click on datafiles > colormanagement and what you see in this folder is what you need to replace.
Just delete everything in the folder and replace it with the files you can download here. This is contains a changed version of the ACES config file, which. is reduced from over 300 color spaces to just the view that is relevant in Blender.
Now ACES is installed, but using it is different to filmic, so read the How to use ACES in Blender section, before you use it.