Before you update you D-Lab 3.0, 3.01 or 3.10 to the latest D-Lab version, it is recommended to backup your data and additionally the old D-Lab version.
Therefore make a copy of the folder C:\Programm\D-Lab and rename this copy to “D-Lab 3.xx”. You will then have the option to downgrade to your old D-Lab version.
After this backup download the new D-Lab 3.xx Setup and install it.