It doesn't matter if you have internet or not! Download the Desktop app, login and use it with your data in the cloud. Desktop app checks if there is internet or not, if the connection is slow or fast. Let it save your sales on your computer and integrate it into your web and mobile applications so that you can reach it with one click.
What you need to do before downloading. Read this page completely!
In order to use the desktop application, Microsoft .NET Framework 4.7.2 must be installed on your computer.
For Microsoft .Net Framework 4.7.2 runtime driver, if installation failed during installation, you can complete the installation by downloading the “offline installer”. : Microsoft .Net Framework 4.7.2 Offline Installer