OverseerFM changes versions when the science engine of the model has been updated with the latest science e.g. When Plantain was included as a pasture type.
To see which version you are currently working in, click into your farm account.
In the screenshot below you can see that on each analysis on the right hand side you will see v6.3.4.(**NOTE - this version number will change as we further develop the software).
This is the version number of Overseer your are working in.