Before you install the upgrade, make sure to make a backup copy of your observations database.
This file is usually called WillyBase.mdb, the exact location of the file is shown in the title bar of WillyBase when it is running. Then click the "Load update" option from the "Update" menu in WillyBase and select the downloaded update files (one at a time).
When an update has finished, it is a good idea to make a copy of the log messages and review them to check if everything went ok.
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