DbGate is available for various platforms, installation process is dependend on platform.
Windows supports msi installer and portable ZIP installation. Autoupdater is supported for MSI installer.
Linux supports snap packages and AppImage distribution. Both supports autoupdate (SNAP supports it natively)
For Mac, DMG installer is available. You must manually confirm validity, as Mac package is not signed.
Follow instucions on docker hub
You could also install web version of DbGate from NPM, please follow instructions on npmjs