Why won't the launcher give me the option of installing Unreal 4.25.3?

The Epic Games Launcher won’t give me the option of installing Unreal 4.25.3.

I installed the launcher on a new machine and want to install unreal 4.25.3, but the launcher won’t list any versions higher than 4.24.3 for me.

How do I get the launcher to let me install 4.25.3?