TheTurtle contains an automatic update system for major upgrades. When a new version is available, just make a "Send" and accept the download and automatic install.

if an error occurs during the download, or if the download freezes, don't hesitate to restart TheTurtle and try again (up to 3 times).

If the auto-update persist in not working, just download the new version and launch it. There is no need to uninstall the previous version. In all the cases your will not lose your data.