1) All last builds of Psi for Windows and macOS were done without PsiMedia plugin (for audio and video calls). Support of this plugin for Windows and macOS will be re-added in Psi 2.0. 2) OMEMO plugin will be available in Psi only starting from 2.0 release. If you need this plugin right now, use official builds of Psi+ project (development branch of Psi). See details in README. 3) Psi 2.x releases