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I am new to this project. The project was developed in 2015 using Raspberry pi2 and a 7' touch display. The disk image works perfectly on Raspberry pi 2. I tried to flash the disk image to an SD card and load it to the latest raspberry pi4. But It is not showing anything on the display. If I load Rasbian OS to the pi4, it works.
Are there any changes or updates needed when we switch to the latest version? The programs are all done using Kivy I guess(Python).
The Pi4 was released on 24 Jun 2019 and requires Buster.
The only (reliable) way of upgrading is to perform a fresh installation.
You will then have to reinstall applications you use.
If you have a compiled program it may work, but this depends on what resources it uses. One thing for certain don't use a 64bit OS - which is almost guaranteed to fail. If I were doing this I would avoid Bullseye and use "Legacy" i.e. Buster.
/boot. These would not be present on your old Pi2 image. Have a search for updated Pi4 boot files.