This is excellent learning for me when it comes to packaging Unreal Engine games, so thanks again. I don't have much experience in this. I have created yet another build which should fix it. Without the Itch.io App.
It is hard for me to test as I dont have a clean windows, and virtualization wont run UE games :'(
It will start the installer of the redistributables if they are missing on your system. Those VS C++ redistributables are core to all Unreal Engine games. Once you have it, you wont need to install it again for other UE games.
I learned this now thanks to you <3