By means of the method, an operating system (B) of a machine controller for an injection molding machine (SGM) for processing plastics is provided on a target system (Z) having a processor (P), which target system is independent of the injection molding machine. For this purpose, information about an operating system (B) of a machine controller (MS) of an injection molding machine (SGM) is provided, which operating system can be configured or adapted to the characteristics of the injection molding machine (SGM) by means of configuration data of a first machine configuration (MK1). The operating system (B) is installed with all the configuration data as a digital twin on the target system (Z), using a hardware-independent app to convert the information for the target system. On the target system (Z), a new setting dataset (EDl) is created or an existing setting dataset (EDl) for producing injection-molded parts is changed, the setting dataset being able to run on the injection molding machine (SGM, SGM1). The setting dataset (EDw) created or changed on the target system (Z) is transferred to the injection molding machine (SGM) and the injection molding machine is operated therewith.