I am curious about how to upload the kuka krc2 program.

Use USB Stick and KUKA HMI on KCP.

one option is to use archive

but for individual programs, the simplest and fastest way is to do as hermann suggested:

1. login as expert (so other drives can be seen on HMI)

2. connect USB stick

3. use HMI to copy/paste files to/from USB stick

instead of USB stick you can also use Ethernet. just share folder on D:\ so you can access it remotely and still use HMI to transfer to/from KRC and that folder