I submitted Manifold official versions to Winget commuity package repo.
winget-pkgs/manifests/m/ManifoldSoftware at master · microsoft/winget-pkgs (github.com)
Currently it is not possible to add portable versions.
If one has winget then:
winget install ManifoldSoftware.Manifold-Viewer-Release-9
winget install ManifoldSoftware.Manifold-Release-9
winget install ManifoldSoftware.Manifold-Release-8