VS Code may show a yellow banner saying your version is unsupported. Click "Don't Show Again" – it will not affect functionality on Win 10 1703.
If you specifically need a version from 2021 or the legacy "1.70.3" build, you can find them through these official and community-trusted channels: Final Windows 7/8.1 Support (v1.70.3): vs code version 1703 download 2021