Help me to customize installer like fuze TV

I would like to do the POC on the customizing the installer like fuze.TV. May I know, How to dot the same?

On this doc, you can find all the info: https://overwolf.github.io/docs/start/custom-installer-for-your-app#docsNav

After all your assets are ready, you should contact your OW dev rel manager to upload them.