Geometra offers no download or installation as traditional app, however with modern browsers this is not needed to be able to offer a similar experience as a native desktop or mobile app.
Microsoft Edge and Google Chrome both offer the option to ‘Install as App’ for Geometra.
In Edge click the installation button in the address bar.
In Chrome click the installation button in the address bar.
For iOS and iPadOS Safari offers the option of “Add to Home screen”. Click the Share button and choose “Add to Home screen”.