S5-115H. upload software from redudant PLC

Help with a PLC S5 115H

I have a S5-115H and I need to upload the program from redudant plc.

I have Step 5 7.22 but I don´t know if I need other software called COM-115H.

Someboy can give me some intructions to recover the program.

Thanks a lot

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Split from Suggestion Rqd for :Siemens PLC S5 115H CPU not coming to RUN status .