SIC8051F.dll not found

We have a smartRF evaluation board that contain Silicon labs C8051F320 USB MCU. The source code were compiled in Keil C51 V7.50 compiler. Now when we run this code to modify /change it in c51v805 or c51v812 compiler,an error message show /BIN/SIC8051F.dll not found . In this time what can I do? How can I get Keil C51 V7.50 compiler?

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