You can use Euroscope's own server to do this. You will firstly need to download the licence key (PublicVatsimLicense.lic) from https://drive.google.com/drive/folders/1rsBunTadLEvUpljJk-Jd0jL7Mqe18GFw. Then find "Euroscope FSD Server 1.2" in your start menu. When prompted, select the license file previously downloaded. Now open Euroscope, in the menu where you connect to VATSIM you will need to change two things: 1) Untick the "Connect to VATSIM" box and, 2) Change the server to "localhost". You can now start a Sweatbox session as you would on the VATSIM Sweatbox server but instead it will run