As far as I know, the S5-110, -130, -150 series stores their programs in a different way from the newer versions (like S5-100, -115, -135, -155).
So it may be difficult to import the original S5 program into the S5-to-S7-converter in STEP7. You must have the program file with an .S5D extension.
If you do not have such an .S5D file you may have to manually redo the entire program.