Yes, this version requires MKS runtime. The correct MKS version is 9.1 or above. It is automatically installed when you install Robcad. It is not included in Process Simulate, nor it is available independently on GTAC.
If possible download Robcad, which includes the MKS ToolKit.
If not, contact hotline of Siemens PLM via GTAC and they can give it to you.
These are the official ways.