recflare/client ? reverse-engineered prompt

Build me a simple Windows installer and setup script for a Rec Room custom client called RecFlare.

I want the setup to ask whether I already have Rec Room in my Steam library, then either download the game through Steam or pull the game files from a mirror if I do not. After that, it should install the 2025 patch, configure it to connect to the RecFlare servers, and create easy shortcuts for both desktop and VR mode.

Also include a manual download option with a batch script that does the same setup steps for people who do not want the installer. Make it easy to change the server addresses later if someone wants to point the client at a different custom server.

If anything needs current instructions or tools, look up the latest docs online.