AppBuilder project compatibility across versions

Create a new project in 2.2.5, name it, then save it as a folder.
Close Appbuilder 2.2.5
Open the 2.2.5 new project folder in a windows explorer window
Open a new windows explorer window and navigate to the location of the 2.1.7 project file
Rename the project file with a .zip extension (erase the existing extension)
Unzip the 2.1.7 project .zip file
Copy the .mdb file and the data folder from the 2.1.7 project and paste it into the 2.2.5 project
Open Appbuilder 2.2.5 and then open the new 2.2.5 project folder (Open > Folder)
Verify the data from the 2.1.7 project is now in the 2.2.5 project
Adjust the model hyperparameters (ANN, wavelength range, Neuron #, Decay value; they can try using the same ones that they used in 2.1.7 or try new ones) and train the model
Save the new 2.2.5 project as either a folder or file (depending on their preference)

Opening old appbuilder projects with the newest Appbuilder can throw an error. If you get an error, these are steps to try -