Unless the source code was saved in the CPU, you won’t be able to upload the program.
This being a compact CPU with only 3mb of user memory, I would say that it is unlikely to store the source code on the CPU.
Making the connection to it should be simple if you know the IP address.
In Automation Studio, go to Online, then Settings. A window should appear for you showing any preconfigured connections. It should too automatically scan for any devices and then display them in a window for you if you are connected locally to the PLC and not across routers or vlans.
If no devices are found or the configured list is empty, you can add a connection to the list by clicking the Add TCP Connection, then enter the IP address.
Once connected to the cpu, you will need to search through the menu at the top of the software and look for Upload Source Code From Device. Again, it’s unlikely the source code is there.