Terraform Cloud agents do not have binary releases for Windows. However, the agent can still be used on Windows by utilizing Docker.
Before running the Terraform Cloud agent on Windows, ensure that Docker is installed within the Windows machine. Instructions on installation and setup of Docker on Windows can be found here: https://docs.docker.com/desktop/install/windows-install/
Once Docker is installed, the typical deployment pattern for running an agent in Docker should function identically on Windows: https://developer.hashicorp.com/terraform/cloud-docs/agents/agents#optional-configuration-run-an-agent-using-docker