In preparation for the release of WASM support on Xbox alongside Sim Update 12 on March 21, the Xbox WASM add-on ("Microsoft Flight Simulator: Add-on Support") will be updated today.
Users do not need to install or update "Microsoft Flight Simulator: Add-on Support" before the launch of Sim Update 12 on March 21, which is when Support for WASM on Xbox will be enabled.
Once Sim Update 12 is live, "Microsoft Flight Simulator: Add-on Support" will automatically install or update to the latest version when Microsoft Flight Simulator is launched on Xbox.