Hi,
The RTC 1002 is manufactured by Rohde & Schwarz, and they utilize a different licensing scheme than Hameg.
First you will need to provide a memory dump from the firmware, which requires you to open the scope, and connect a HW debugger to the JTAG port.
Once you have dumped the memory, somebody from this forum might be able to assist you.
Also the the R&S serial numbers normally contain two alphanumeric digits at the end, so your serial number should look like 102546-xx
Regards