Unfortunately, since you have an older version of OptiSystem you will not be able to open the file. You should be able to use your original project file but make these changes:
1) Change the run command to “aaa;” which is the name of the file and also switch back the Matlab search path to where you can find the file.
2)For some reason the Optical Receiver that came placed in your file was giving me an error so I just deleted it and placed a new one and it worked fine, maybe you changed some parameters? I also changed the Bit rate of the Bit Sequence Generator to scripting mode and used the global parameter Bit rate to control the value, which is the default option.
Regards